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Jimmy9190
Dodge Dakota
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3/15/2008
22:43:27
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 Subject: TPS too tight? Need help please
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Hello everybody,
I put a v8 throttle body on my 3.9 today and it went well, the throttle cable seems ok and all. The truck runs good but it doesn't accelerate or decelerate right. I have to really press the gas down hard to get going and when shifting up into each gear (it's a manual 5-speed). Then when I let off the throttle like when slowing down and dropping it into second gear to turn right or left, it's like I have let off the throttle and the engine gets no gas. Then I have to stomp it to get going thru the turn and I'm at way too high an RPM. With the V6 tb and still with this same original throttle cable the throttle was very smooth and never had any problems.
Is this a symptom of tightening the TPS down too tight? Some of the posts on the TPS mod say not to tighten it too tight, and I know I tightened it real tight by hand with a torx screwdriver. From what I saw with it the sensor will only go on one way so I think I have it lined up on the throttle plate shaft correctly. I will loosen the screws up tomorrow and try again, but if anyone here has any ideas on this I would really appreciate it.
Thanks,
Jimmy
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daddio
Dodge Dakota
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3/16/2008
09:25:44
| RE: TPS too tight? Need help please
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didn't you modify the linkage somewhat? you may want to make sure that when you're mashing that go pedal the TB is getting FULL open.
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Jimmy9190
Dodge Dakota
JOIN HERE
3/16/2008
09:46:57
| RE: TPS too tight? Need help please
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Yeah I had to cut off a right-angle shaped part of the new one to be able to get to the stud for the throttle cable so I could drill it out and put in a ball stud to attach my throttle cable. I think that part was for the TV cable for the van it came off of. Then I had to cut off another piece in the front end of the linkage that had a part that looked like some kind of guide, maybe for the cruise control cable on the van. The linkage works fine by hand but by foot it feels stiff and I have to press harder on the pedal to get the truck moving and wind up tacking it up over 3000. There's no slack in my cable and it looks like it opens up all the way. I test drove it up to about 85 mph last night so I don't know if that is it or not. I'm about to go check it all again and loosen up the TPS screws. Just about everybody here who did the V8 tb has had real good results from it so this has to be some kind of error on my part.
Thanks for your help. I appreciate any other ideas you might have on this.
Jimmy
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GB2000
GenIII
3/16/2008
11:18:43
| RE: TPS too tight? Need help please
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Did you swap out the sensors or reuse the ones from your original throttle body? If you swapped any sensors out...reset the computer. Could be a calibration issue. It's recommended to reuse your old working sensors since you know they work.
Also try loosening the tps bolts up some...I'd just snug em up and then tighten them a lil further beyond that. As long as they're not TOO loose, they won't work their ways loose and back out. They don't need to be super tight though.
Also like mentioned...check and make sure when the gas pedal is to the floor, the throttle plates are opening up most of the way and not part way. That sounds like the most likely answer honestly...
ALLLLSO...check your tv cable (kickdown cable) adjustment...make sure that it begins to move smoothly as soon as the throttle plates begin to open and that when the throttle plates are all the way open, it's not trying to pull the lever on the transmission further than it's designed to go (or it'll bend/break the lever).
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Jimmy9190
Dodge Dakota
JOIN HERE
3/16/2008
11:53:28
| RE: TPS too tight? Need help please
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Thanks GB2000. I just got through checking the TPS. When I installed the TB yesterday I used the original sensors from my V6 TB. I checked my TPS voltage and it's at .6 when closed and at 3.4 at WOT with the iginition on. I even checked the one that was on the TB from the junk yard and it was not reading the same as my old one. It was off but I didn't write down its voltages. Funny thing is when I first went out and loosened the screws on my TPS I heard a click noise like it was relieving some sort of pressure in the sensor when I loosened the first screw on it.
The throttle plates go wide open when I floor the throttle. I don't think this is related to the throttle cable, it appears to be OK. I even took off the bracket from my original TB and put it on the new one, but I have my doubts on that because they are identical. My truck is a manual so I don't have the TV cable. I'm about to go test drive again, I sure hope it works right this time.
Thanks for your help.
Jimmy
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Jimmy9190
Dodge Dakota
JOIN HERE
3/16/2008
12:58:53
| RE: TPS too tight? Need help please
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That's what it was alright. With the TPS mounting screws not so tight the throttle works perfectly. That V8 TB is working great and my truck runs like an 8-legged dog now. Throttle response is improved about 200% and the top end is so much better than it was before, even after I had added a 180 tstat and 3923's last week. I'd highly recommend the V8 TB to anybody with a V6.
Thanks everybody for helping me here.
Jimmy
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daddio
Dodge Dakota
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3/16/2008
14:06:12
| RE: TPS too tight? Need help please
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glad to see you got it running right. i'll have to give my dak some TLC next weekend. this weekend was for the wife's protege'. needed a radiator and new front pads. it's good for another 110k now.
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Jimmy9190
Dodge Dakota
JOIN HERE
3/16/2008
14:21:49
| RE: TPS too tight? Need help please
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Message:
Thanks again Daddio. Sounds like you had your hands full too. I knew there had to be some simple reason why that TB was giving me such trouble and thought of the TPS mounting screws last night and searched here and found some posts to confirm it. This site and the people on it are great. I try to pitch in and help where I can, but I know more about electrical and accessory problems than the mechanical end of it all. I have learned a lot on here and from working on my own Dak though.
Now I just need to find out for sure about my belly pan gasket. I thought Dodge finally got that fixed around the 2000 model year, like when they realized their error on the 1990's timing chains. My own truck is running very well right now so I may just leave well enough alone unless it starts burning oil or pinging. For now am heading out to wash and wax.
I really appreciate all the help here.
Jimmy
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daddio
Dodge Dakota
JOIN HERE
3/16/2008
19:45:14
| RE: TPS too tight? Need help please
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well i've got about 85k on my '00 and everything with the pan gskt is good.
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GB2000
GenIII
3/16/2008
20:27:11
| RE: TPS too tight? Need help please
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I've got 86k on my 1998...tranny is screwed up and has been for a while...ball joints have been replaced, calipers replaced, rear shocks replaced, front shocks ordered, front end problems, speed sensor went out...I can keep going and going probably...
But that engine is reliable as hell...NEVER had any engine problems other than an issue with it missing horribly when my distributor cap came loose or when my IAC gets dirty.
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Jimmy9190
Dodge Dakota
JOIN HERE
3/16/2008
21:00:25
| RE: TPS too tight? Need help please
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Mine's a 2001 and has about 84,500 miles on it. I bought it used with 42,000 miles. Other than needing a new ac compressor and stabilizer bar links, it has only had ordinary maintenance done on a very regular schedule. The only fault I can really find with my Dakota is I wish the AC and blower fan were stronger. A tech at a Dodge dealer told me the Dakotas just don't move that much air. I read that here too.
I hope to keep my Dak on the road for a long time. Unless I get the symptoms of the blown belly pan I am leaving well enough alone. It could just be from the blow by in the manifold. There is no PCV valve but I do have a vaccuum line going from each side of the manifold to each valve cover. Maybe that's the source of that little bit of oil in the intake, I don't know.
Thamks for all the help here.
Jimmy
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GB2000
GenIII
3/17/2008
04:09:13
| RE: TPS too tight? Need help please
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I also have a/c issues...stupid thing has a leak...blows warm air til I refill it. Blows cold for a few weeks and gets warm again. Something else I need to fix...
When it worked, that air got coooooold though...
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Jimmy9190
Dodge Dakota
JOIN HERE
3/17/2008
11:27:17
| RE: TPS too tight? Need help please
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That sounds like a leaking evaporator core. Is the carpet wet under the dash on the passenger side? Does the AC have a moldy or mildewed smell to it?
Jimmy
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