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Steve Cutchin
Dodge Dakota
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5/05/2003
15:13:48
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 Subject: Throttle Position Sensor Mod - Hated It
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I drive my 2000 4.7 auto in rush hour traffic every day, I'm talking DC-area crawling, and yes it sucks. When I gave it gas the truck would accelerate too much, I noticed the idle would increase by about 300rpm as soon as the truck hit 5mph. I wanted to try the TPS adjustment, so I drilled the inserts out and set it to 0.7V and the problem was WORSE. I barely tapped the throttle, up went the idle and off went the truck. To accelerate slightly I had to hit the gas and then keep the brakes on. I actually adjusted the TPS back the other way, I think I'm at around 0.25V now (stock was around 0.45 I think.) Any thoughts? Has anyone else noticed that the idle increases when the truck hits around 5mph?
BTW possibly seemed a little better at 25+mph, there wasn't as much hesitation between throttle and acceleration, but I couldn't put up with the surging at parking lot speeds.
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Chris
Dodge Dakota
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5/05/2003
15:16:50
|  RE: Throttle Position Sensor Mod - Hated It
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THis sounds very feasible.. How long did you drive with it at .7V? I just ask because mine was at .5 and when I went to .75 I noticed nothing...
Chris
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HSKR
Dodge Dakota
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5/05/2003
15:31:45
| RE: Throttle Position Sensor Mod - Hated It
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The whole point of doing the TPS mod is better off idle acceleration which is what you described, and if you are moving at 5mph, you aren't idleing. The engine keeps the revs up slightly to keep the truck moving, otherwise it would stall. Would you rather the truck stall from bogging down, or keep running but at a higher RPM?
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Steve Cutchin
Dodge Dakota
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5/05/2003
15:51:39
| RE: Throttle Position Sensor Mod - Hated It
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I drove on 0.7 for a full week, maybe 400 miles total.
HSKR - From a stop on level ground, if I accelerate up to about 5mph and just let off the gas, the truck would idle at close to 20mph. That is a lot more power applied than what I would consider necessary to "keep the truck moving." I think you are confusing "better" off idle acceleration with "MORE" off idle acceleration. There is a difference. Better means controllable, as in X amount of throttle yields Y amount of acceleration, and 2X throttle yields 2Y acceleration. With this truck, virtually zero throttle yields way too much acceleration, and that is definitely NOT "better" driveability. To me, better means "doing exactly what I want it to do."
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HSKR
Dodge Dakota
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5/05/2003
18:25:29
| RE: Throttle Position Sensor Mod - Hated It
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As I said, the mod definitly wasn't what you wanted to do. For most of us who do the TPS mod, we are racing our trucks, and want the quicker off idle(quicker IS better) acceleration. My R/T will coast at 15-20mph with the RPMs about 1K unless I push on the brake to slow it down. You are confusing running in gear with idleing. Idle is sitting still with the truck in park. The engine will ALWAYS run at a higher RPM with the tranny in gear than with it in park. It HAS to so the engine won't bog down from the extra pull on the engine. Like I said, would you rather your engine ran in gear at 500RPM an bog down really bad almost to the point of dying??
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franlofter
Dodge Dakota
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5/05/2003
19:14:32
| RE: Throttle Position Sensor Mod - Hated It
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I think a lot of the little mods on these boards are not good for a daily driver, TPS, IAT relocation, Fan clutch removal etc etc
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Brian C
Dodge Dakota
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5/05/2003
20:16:13
| RE: Throttle Position Sensor Mod - Hated It
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No.. they are for people that want performance out of their truck. If you want economy you should buy a Honda or a pos Mazda
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rtdkota
R/T
5/05/2003
23:32:22
| RE: Throttle Position Sensor Mod - Hated It
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" drive my 2000 4.7 auto in rush hour traffic every day, I'm talking DC-area crawling, and yes it sucks. When I gave it gas the truck would accelerate too much, I noticed the idle would increase by about 300rpm as soon as the truck hit 5mph"
--- If you put the truck in neutral, I'll bet ya the idle goes up--- if so-- you have a powersteering pump sensor that is whacked-- The sensor ups the rpm to offset the load-- and can cause the idle to increase and or hang. If you still have a warranty left, take it to your dealer-- otherwise-- you'll need to pay the $$$ to fix it.
Sam
www.socaldakota.com
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Steve Cutchin
Dodge Dakota
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5/06/2003
14:12:46
| RE: Throttle Position Sensor Mod - Hated It
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When I put it in neutral the idle drops. I understand completely that the FI has to apply additional fuel to keep the truck from stalling when it is stopped in gear, but that isn't what is happening here. Put the truck in gear and the idle basically stays the same, as it should, but hit 5-10mph and the idle goes up by around 300rpm, and that has nothing to do with keeping the engine from bogging. That is poor driveability, plain and simply, and Dodge really dropped the ball on that one. I guess I'm jaded coming from a 2-wheel background, where you have to have a PERFECT connection between the throttle and the engine. I have owned two fuel injected street bikes, raced one of them (road course, not drag), and in comparison the mapping that Dodge used is crap - there is no need to increase the throttle by 300rpm when the truck hits 5-10mph. Unfortunately it seems that most people posting here just don't understand what good FI mapping is, obviously Dodge doesn't.
I agree with what someone above said, that a lot of these mods are definitely not for street-oriented driving, unfortunately it seems that the base truck itself has some issues that make it less than enjoyable for street-oriented driving also.
I have actually started taking my wife's Jetta to work lately, it is also a 2000. Gets much better gas mileage, but I just don't enjoy driving it like I do the truck, but with the Jetta you let off the gas and the car slows, so it gets the nod for driving to work now. Too bad Dodge can't learn a lesson from VW when it comes to fuel injection mapping.
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mj
Dodge Dakota
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5/06/2003
14:45:29
| RE: Throttle Position Sensor Mod - Hated It
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Here is a sugestion. Redo the TPS adjustment, paying close attention to the instructions from Speedtweaks. Allow the processor to relearn the new settings. Then see what happens.
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IntenseDak39
*GenIII*
5/06/2003
14:54:40
| RE: Throttle Position Sensor Mod - Hated It
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if you do lower the tps voltage, do not go lower than .35 volts. The computer works with the tps in the range of .35 to .95 volts and if lower or higher, it could trigger a code or check engine light.
1998 Regular Cab V6 Auto
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graphiteRT
R/T
5/07/2003
16:28:38
| RE: Throttle Position Sensor Mod - Hated It
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The upper and lower range limits for the TPS are .25 and 4.49, respectively, as taken from the FSM. Anything outside those numbers will trip a mil.
Bob
'01 Graphite CC R/T, MP headers, Magnaflow muffler into 'Cuda style exhaust, M1 2bbl, ported 2.02 R/T heads, custom grind cam, Crower SS rockers, Paxton Novi2000, Boyd's 20s w/Dunlop SP9000s, Featured in April '03 Sport Truck, Viper 4 wheel discs
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IntenseDak39
*GenIII*
5/07/2003
17:18:00
| RE: Throttle Position Sensor Mod - Hated It
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bob, i was referring to it being "on" but not running... sorry i was going by what the haynes manual says...
that .25 to 4.49 is the range while the engine is running.
1998 Regular Cab V6 Auto
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chris
Dodge Dakota
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5/17/2007
22:20:54
| RE: Throttle Position Sensor Mod - Hated It
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my dakota v8 4.7 idles at 500 rpm at a light...if i put itin neutral it goes up...is this normal?....also my check engine light is on with code p0455...iv'e read this is the gas cap...if not what else can it be?
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Kowalski
GenIII
5/18/2007
15:44:25
| RE: Throttle Position Sensor Mod - Hated It
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Normal - just the drag from the auto tranny. Check the rubber emissions vapor lines.
Lead, follow, or get out of the way
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OBIO3
Dodge Dakota
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5/20/2007
19:51:37
| RE: Throttle Position Sensor Mod - Hated It
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Couple of things not mentioned. When you changed the TPS setting, did you disconnect the battery so as to start a proper PCM RESET> # 2 ... With your HAND and truck in park, try VERY SLOWLY pushing down on the gas peddle. it just may be slightly sticking on you. worth a try.
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Kowalski
GenIII
5/21/2007
15:27:50
| RE: Throttle Position Sensor Mod - Hated It
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Changed the TPS setting ? I thought he just tagged onto a 4 year old post...
Lead, follow, or get out of the way
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trjohn57
Dodge Dakota
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9/11/2010
11:51:24
| RE: Throttle Position Sensor Mod - Hated It
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I have a 98 dakota and it misses a little. Do I clean the TPS to see if that helps? No codes tripped on this problem.
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LOL
Dodge Dakota
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9/11/2010
15:57:17
| RE: Throttle Position Sensor Mod - Hated It
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U can not clean the TPS.......
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trjohn57
Dodge Dakota
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9/12/2010
11:59:35
| RE: Throttle Position Sensor Mod - Hated It
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Ok, thank you. I thought I read where someone cleaned the soot off of theirs and it fixed the problem. Did change the plugs and it was no different. I see they say there is no egr in a 98 dakota. I'm still stumped.
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daddio
Dodge Dakota
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9/12/2010
13:36:35
| RE: Throttle Position Sensor Mod - Hated It
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Not the TPS. You need to clean the TB and the IAC. Remove the IAC from the throttle body and clean the plunger and the orifice on the TB. DO NOT turn or push the plunger on the IAC. Be gentle with it.
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