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Throttle body positioning sensor?

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Old Aug 27, 2011 | 09:12 PM
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Originally Posted by Buckshotmckee
IAC sensor?
Changed it
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Old Aug 27, 2011 | 09:14 PM
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Cleaning the TB and the IAC isn't a bad idea, but if he can 'idle fine in neutral all day' doesn't sound like that's it.
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Old Aug 27, 2011 | 09:14 PM
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Originally Posted by MudCrazed!

Changed it
Yep. Not IAC
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Old Aug 27, 2011 | 09:17 PM
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Tps. No. Iac. No....starter issue?. Or other sensors...the symptoms don't add up. A bad tps or iac would act up in any gear.
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Old Aug 27, 2011 | 09:18 PM
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Originally Posted by CattyXJ
The MAP sensor, IAT sensor, coolant temp sensor, O2 sensors, etc all play into air/fuel mix. I said I don't think TPS because symptoms of a faulty TPS are typically low, high or surging or fluctuating engine speeds at idle or in drive. The only way to know for sure is to hook it up to an OBDII reader which most parts stores will do for free and/or get a multimeter and test resistance/ohms at each sensor. I still think you should give it a tune up though
I've ran codes comes back clean. Even took it to a friend who specializes in cherokees. He can't figure it out either.
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Old Aug 27, 2011 | 09:21 PM
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it doesn't always throw a code..
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Old Aug 27, 2011 | 09:22 PM
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Originally Posted by MudCrazed!

I've ran codes comes back clean. Even took it to a friend who specializes in cherokees. He can't figure it out either.
Other than testing sensors, check for vacuum leaks and look for bad grounds. The grounding strap near the back of the valve cover attached to the firewall and the one on the passengers side of the block about 1/2 down the oil dipstick are the two to start with.
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Old Aug 27, 2011 | 09:23 PM
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Originally Posted by UsmclovesXJ
Tps. No. Iac. No....starter issue?. Or other sensors...the symptoms don't add up. A bad tps or iac would act up in any gear.
The starter is engaging and the motor is rolling over...it's firing as well.
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Old Aug 27, 2011 | 09:28 PM
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Originally Posted by CattyXJ
Other than testing sensors, check for vacuum leaks and look for bad grounds. The grounding strap near the back of the valve cover attached to the firewall and the one on the passengers side of the block about 1/2 down the oil dipstick are the two to start with.
The only thing that was leaking was the intake gasket. i checked the fire wall ground but not the other. I will try that in the morning.
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Old Aug 27, 2011 | 09:35 PM
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What is it like when you accelerate from a stop? Smooth or shakey and won't upshift?
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Old Aug 27, 2011 | 09:42 PM
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Originally Posted by UsmclovesXJ
What is it like when you accelerate from a stop? Smooth or shakey and won't upshift?
She accelerates beautify. Every once in a while, I'll notice her sticking in third, but a soon a my foot lets off the pedal just a hair, shifts right in.
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Old Aug 27, 2011 | 09:47 PM
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Hmmm...my tps when bad I almost couldn't get out of first. And 3rd stuck to... Get outt your Haynes manual and test your tps
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Old Aug 27, 2011 | 09:55 PM
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Originally Posted by UsmclovesXJ
Hmmm...my tps when bad I almost couldn't get out of first. And 3rd stuck to... Get outt your Haynes manual and test your tps
Ah, the bible lol. Been though that thing so much it's falling apart.
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Old Aug 27, 2011 | 09:59 PM
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Originally Posted by MudCrazed!
Ah, the bible lol. Been though that thing so much it's falling apart.
ohh yes lol its the best.
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Old Aug 27, 2011 | 10:53 PM
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Have oh thought of our ignition pickup? Could be.intermittent.
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