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REKER
GenIII
 
9/03/2002
10:19:19
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 Subject: Hesitation at Start up??
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Message:
When i start my truck up in the morning before i goto work, sometimes i will get a hesitation when i give it gas. It also happens sometimes when i start it up and leave it running for a few seconds and i dont even give it any gas and it hesitates and sounds like its about to shut off but then revs back up. Anyone have this similiar problem??... What should i do about this and does anyone know what is causing this???..
ROB aka REKER
2000 Intense Blue Club Cab
fully loaded
4.7L V8 Auto 4X4
3.55 Gears
Mods to Come:
3" PA Body Lift, 33" ProComp Xterrains mounted on Eagle Alloy 589s, Dual Flowmaster Exhaust, Custom Intake, Clear Corners, Carbon Fiber Altezzas, Custom Painted Dash
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Todd W
GenIII
9/03/2002
12:55:55
|  RE: Hesitation at Start up??
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Mine does that too, I always chalked it up to the engine running rich at startup (sort of like how it works on carburated vehicles, the choke) until it gets to a pre-determined temperature and the computer evens the mixture out. I might be wrong though
It's possible that the hesitation isn't being helped by the clutch fan either.
"I think I hit my excitement threshold about ten minutes ago..."
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REKER
GenIII
9/03/2002
13:20:53
| RE: Hesitation at Start up??
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Message:
hmm.. wonder what it is??
ROB aka REKER
2000 Intense Blue Club Cab
fully loaded
4.7L V8 Auto 4X4
3.55 Gears
Mods to Come:
3" PA Body Lift, 33" ProComp Xterrains mounted on Eagle Alloy 589s, Dual Flowmaster Exhaust, Custom Intake, Clear Corners, Carbon Fiber Altezzas, Custom Painted Dash
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Todd W
GenIII
9/03/2002
16:09:33
|  RE: Hesitation at Start up??
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Message:
Like I said, I think it's the computer controlled, fuel-injected, version of a choke. I don't think I've ever driven a vehicle that wasn't sluggish on initial startup until it hits operating temps. Engines are designed to run at a certian temp range, and when they are out of that range, they don't run quite as good.
"I think I hit my excitement threshold about ten minutes ago..."
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DaveR
GenII
9/03/2002
16:57:47
| RE: Hesitation at Start up??
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Once I put the M1 on mine initial atartup got real bad. Sounds like it's camed for a few seconds. Every so often it acts like it wants to die out when I get on the gas after it is first started, but it hasn't died yet. Just becomes unresponsive for a second.
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Todd W
GenIII
9/03/2002
19:23:45
| RE: Hesitation at Start up??
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Thats -exactly- what mine does.
"I think I hit my excitement threshold about ten minutes ago..."
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Drew
Dodge Dakota
JOIN HERE
9/03/2002
19:26:19
| RE: Hesitation at Start up??
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Dudes, duddettes......i believe i have the solution to your problem, now, i'm not much of an engine expert but i believe you need new spark plugs. Based on a bunch of the posts i'v read. Autolite is the best brand....so, check it out, i left a post on general board asking about em so if AYNBODY KNOWS, please post.
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DaveR
GenII
9/03/2002
19:37:07
| RE: Hesitation at Start up??
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I changed to a set of denso's after I put the M1 in trying to get some other probloms sorted out, so I don't think it's plugs. Besides that I run a hot coil with an MSD box so I got plenty of spark. I have also changed out the solinoid on the back of the TB that controls the idle. That helped a bit, but it is just plain nasty at startup. A freind of mine has an Intrepid that does the same thing at startup, so it might just be the chrysler code. The other thing that I haven't explored is the EGR system.
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J-R-M
Dodge Dakota
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9/03/2002
21:29:27
| RE: Hesitation at Start up??
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Well what happends is you have a lag in Throttle Response. If you think about it you have all them sensors trying to get info to the computer at the same time which works great when the engine is at operating temp. When you have a cold engine the computer is not looking at all the senors. Make a long story short when you dump alot of Air or a little the computer has to take the info in and send out signals to the injectors which takes a little time and thats why you have a sluggish response when it is cold.
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Brian Maier
Dodge Dakota
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9/04/2002
00:29:57
| RE: Hesitation at Start up??
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I have been having that same problem. It started in the last 5000 mi. I just changed my plugs to autolites, upgraded my wires, added a msd 6A, and a Accel super coil. I dont remember exactly but i think is started sometime around the time that i put a 180 t stat in.
Brian
1994 3.9l 2WD CC Dodge Dakota
JBA headers, JBA 8mm wires, Borg Warner Select Cap & Rotor, Autolite 3923, MSD 6A, Accel Super Coil, K&N FIPK, Hi-Flow Catalytic Converter, Flomaster Muffler, Robertshaw 180 T-Stat
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Pfarm
Dodge Dakota
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9/04/2002
05:46:41
| RE: Hesitation at Start up??
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I'm having that problem myself. I suspect it may be a bad sensor. IAC? Maybe.I'm not getting any codes either.Mine seems to clear up after the first drive cycle.When the truck is hot,{restart},
it idles fine. Let it sit for a while and the poor idle, hesitstion is back.Maybe the IAC is getting some bad feedback from the PCM, via another sensor?
Robert.
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Simpleman96
Dodge Dakota
JOIN HERE
9/04/2002
12:14:02
|  RE: Hesitation at Start up??
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I have a 96 (original owner) and have only started having this same prob since I completed most of the common mods on my sixer this year. All sensors are new with the exception of the camshaft, crankshaft, and coolant temp sensor. If the crank or camshaft sensors are bad the engine will not run. However the temp sensor in conjunction with other sensors adjusts the injector pulse range. I picked up a new one for $11 and will install it with a new water pump. I post if it corrects the prob.
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polchartude
Dodge Dakota
JOIN HERE
9/04/2002
13:07:41
| RE: Hesitation at Start up??
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It's ot the plugs or the cap and rotor. As stated above (temp sensor)This is the cure. bad temp. voltage to the pcm.The pcm is adjusting injector pulse freq.to low (to lean)actual engine temp is lower than what the pcm sees. therefor it is giving the engine too much air ad ot enough fuel. I have cured this prob. also with the $11 sensor. If u want to check befor u buy just shut the truck off right after the rough idle in the morning and pull some plugs, they will be white. indicating a too lean condition.especially when the engine is cold.The should have a black puff on the insulator ends after a cold start.
Just my 2 penny's
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polchartude
Dodge Dakota
JOIN HERE
9/04/2002
13:08:48
| RE: Hesitation at Start up??
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sorry bout the N's my puter not too good..
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Todd W
GenIII
9/04/2002
14:38:37
| RE: Hesitation at Start up??
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Nah, thats not mine. Mine's too rich in the morning, indicating to much gas not enough air. Dealer says it's normal when it's cold, like a choke. It goes away by the time I make the street. I'm going to put some Bosh Platniums I bought in as soon as I have a day where I get out of class and -it's not freaking raining-! Gah... Florida sucks... We'll see if going back to the factory heat-range from one cold resolves the issue any.
Anyway, thanks for the input there polchartude, and don't worry about the Ns. Thats some good info you gave. I'm curious, what have you done to that 6? :)
"I think I hit my excitement threshold about ten minutes ago..."
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Simpleman96
Dodge Dakota
JOIN HERE
9/04/2002
20:32:45
|  RE: Hesitation at Start up??
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Hey guys!
Well my water pump and sensor replacement are complete. Results: NO Hesitation this time. I Have lived with this prob for a few months and couldn't stand it. The dealer is dead wrong to tell people its normal like I have read on few other posts similar to this. Mine didn't do it for the first five years. At first, it was only doing it once in a while, only when hot, then sometimes hot and cold, and finally all the time. Im glad it is fixed. Sorry Todd! I hope you get it running right again. For the other guys try the sensor. It may do the trick.
PS. If you ever have to replace a water pump, I highly recommend a Bosch (excellent quality).
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Brian Maier
Dodge Dakota
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9/04/2002
21:22:54
| RE: Hesitation at Start up??
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So which sensor is it? The IAC?
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J-R-M
Dodge Dakota
JOIN HERE
9/04/2002
21:42:55
| RE: Hesitation at Start up??
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Message:
He replaced the Engine Temp and his water pump.
The engine temp makes scence if the computer is getting false readings from that sensor then it could give a rich or lean mix and in turn make it have a hesitation when it's cold or hot depending on what the damand is "your foot".
But don't get the idea that it would trip a code. The only time it would set a code is if the sensor went out of range, and that goes for every sensor. But if it is just giving bad readings and still in range then the computer will compensate with no codes.
Just like Grounds a bad ground can make all kinds of stuff happen. That's why you want to keep your battery post/cables clean and free of corrosion.
Hope I helped.......
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pfarm
Dodge Dakota
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9/05/2002
06:23:40
| RE: Hesitation at Start up??
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I disagree. I just replaced my water temp sensor and I'm still having problems. No change.
Robert
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polchartude
Dodge Dakota
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9/05/2002
07:53:07
| RE: Hesitation at Start up??
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Then it's iether the IAT, or one of the 02's. thats all I can think of that would affect the fuel management from the pcm.
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Dakota Bob
GenII
9/05/2002
07:54:10
| RE: Hesitation at Start up??
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I had the same thing a few weeks ago I had the 180 T-stat in and when I tried to get codes nothing came up. I use to get the code for the engine running to cool it didnt come up any more. I replaced the temp sensor and it was fixed.I also went back to the 195 T-stat the truck runs better with it.
Bob
94 CC 3.9 Stage2 Chip,JBA Headers,19# FI,Flow Master 40s, Auto Lite Plugs, K/N Chrome Filter, 195 T Stat ,TPS Adjustment,Flometrics TB, Mopar Wires
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Simpleman96
Dodge Dakota
JOIN HERE
9/05/2002
17:28:03
|  RE: Hesitation at Start up??
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FU%$! The hesitation came back. It ran good this morning, but this afternoon it was right there again. I guess it is back to the drawing board.
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DaveR
GenII
9/05/2002
17:43:34
| RE: Hesitation at Start up??
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It probobly came back when the computer got used to the new settings.
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steve-on-nos
Dodge Dakota
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9/07/2002
03:01:27
|  RE: Hesitation at Start up??
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back to the hesitation at start up.....when they are not warmed up they all do it.even during warm weather.like during the time your fan runs at start up for a short period.turn the key forward for about thirty seconds(to let the fuel get to the injectors)then start.my truck has 8000 miles,(2000 model)if you rev it right after you start it it seems to not get enough air(cold engine).i let it idle for a couple of minutes,then its fine.
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Simpleman96
Dodge Dakota
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11/13/2002
09:24:07
| RE: Hesitation at Start up??
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Any of you guys ever find out what causes this? Mine is still doing it.
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91DakotaFreak
Dodge Dakota
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11/13/2002
10:11:58
| RE: Hesitation at Start up??
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I have a 91 pre mag 318 and i have the same problem sometimes when its cold but it doesnt always do it. I have replaced the temp sensor and hasnt done it since but i replaced it a week ago so i havent had enought time to know if it fixed it and my other problems or not
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chuck of beef
Dodge Dakota
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11/13/2002
18:16:54
| RE: Hesitation at Start up??
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when you first start your truck and it is cold, computer is in open loop mode running off preditermined levels. what it sounds like is the ac cycling. now i know you think that i`m crazy but it cycles even if it`s winter time. it will put a high load on a cold engine causing your hesitation. on my neon it is even worse but on my car you can cut a wire on the dash to by pass it in defrost mode on the dial. plus at anything above half trottle it shuts off ac unit for passing. i don`t know if it`s the same on your vehicle?
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Simpleman96
Dodge Dakota
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11/13/2002
18:38:20
| RE: Hesitation at Start up??
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Mine does it hot or cold, ALL sensors except the cam and crank sensors are new. My fuel pump has been humming, but it still puts out 50psi consistantly throughout the rpm range. Many have said it sounds like a temp related issue, but that sensor is only weeks old and notrhing changed when I replaced it. Both O2 sensors, map, plugs, cap n rotor, plugs wires, you name it, it is new.
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chuck of beef
Dodge Dakota
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11/13/2002
18:53:33
| RE: Hesitation at Start up??
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i have been a auto tech for quite some time. what i would to is bring vehicle to temp and check the sensors all of them with multi meter. a good repair manual will tell you the ranges for the sensors. did you mess with the fuel system at all, like remove regulator. i hope you also changed your fuel filter. could be dirty injectors. when i clean injectors i don`t mean something you stick in the tank. you need to hook it up the port on your fuel rail and adjust psi to what ever it runs at in normal operation. the cleaner in the can the dealship uses under pressure. not your easy to do job.got to have the right tools.
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chuck of beef
Dodge Dakota
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11/13/2002
18:57:53
| RE: Hesitation at Start up??
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i have been a auto tech for quite some time. what i would to is bring vehicle to temp and check the sensors all of them with multi meter. a good repair manual will tell you the ranges for the sensors. did you mess with the fuel system at all, like remove regulator. i hope you also changed your fuel filter. could be dirty injectors. when i clean injectors i don`t mean something you stick in the tank. you need to hook it up the port on your fuel rail and adjust psi to what ever it runs at in normal operation. the cleaner in the can the dealship uses under pressure. not your easy to do job.got to have the right tools.
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Simpleman96
Dodge Dakota
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11/14/2002
07:10:28
| RE: Hesitation at Start up??
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The injectors are new as well, and it stumbled the same way prior to replacing them. The fuel pump is less than a year old (doesn't mean its good though) and pressure is good. I have the factory service manual and went through the sensors with a multimeter to. I checked the dist indexing also. Im at a dead end now.
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