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david craig
david craig,
Category: GMC
Satisfied Customers: 914
Experience:  owner/mechanic at 3D Automotive
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1994 gmc k1500 sle 5.7 automatic, 164,000 miles. When in

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1994 gmc k1500 sle 5.7 automatic, 164,000 miles. When in park idling, engine hunts. Repaced the fuel regulator, idea control sensor, Co2 sensor and new distributor. Can't figure it out, please help.

Hi Im David, allow me to look up some info for you. thanks.

how about the TBI gasket, possible leaks? or TBI insert in between the TBI and the manifold is causing an issue.

have you tested the tps?

Customer: replied 1 month ago.
by spraying carb cleaner around it, still doesn't change anything

what about testing the tps?

Customer: replied 1 month ago.
I have not tested the tps. I'm currently working and will test that when I get home.

ok. just make sure it reads .45vdc closed and smoothly moved up to 5.0vdc when opened.

Customer: replied 1 month ago.
Ok,one question, this might sound dumb, but is the tps and the ips the same?

no.

no such thing as a dumb question my friend

Customer: replied 1 month ago.
Ok, where is the tps located on my vehicle?

on the side of the throttlebody

Customer: replied 1 month ago.
Ok, I know where it's at. I'll test it and let you know, when I get home. Thank you.

you bet

Customer: replied 1 month ago.
Ok, I guess I made a mistake in which part I replaced. I did replace the tps instead of the ips. I since have replaced the ips and the results are the same. I don't have the correct tool to test the tps.

well the problem could still be with the wiring to the tps. do a visual inspection as far as you can

Customer: replied 1 month ago.
I did that also, the only thing I can see without tearing into it, is the keeper ends on the plug are broke off. It is still plugged in. Should I try and replace the plug?

i would... vibration is a problem if not locked in.

Customer: replied 1 month ago.
Can that plug be purchased at an auto parts store?

i think so. let me check

advance auto part number PT217

Customer: replied 1 month ago.
Ok, sounds good, I'll go get it right now and I'll get back to you. Thank you

any luck?

Customer: replied 1 month ago.
No, the plug won't be in until tomorrow. I have the feeling I'll have to take it in and have someone really look it over. But I'll let you know.
Customer: replied 1 month ago.
Would it be possible the computer is going bad?

I dont think so. its sensor or a air leak somewhere. we just havent found it yet.

do you know how to pull codes on an obd1?

Customer: replied 1 month ago.
No, I don't , advance auto said they couldn't do it.

ok. ill send you instructions

Customer: replied 1 month ago.
Ok, thank you

watch this. and do it and let me know the codes.

https://youtu.be/UIKdbTFvyUU

Customer: replied 1 month ago.
Ok, sure will, not at home at the present time.

ok my friend

Customer: replied 1 month ago.
Hi David, I just got home and of course it's dark out, I'll do what the video instructed me to do in the morning. Sorry just got hung up,with other things. I'll get back to you tomorrow. Thank's for helping me.
Larry

sure larry. my pleasure

Customer: replied 1 month ago.
Good morning David, I've done what the video instructed me to. After getting a code 12 three times, I continue to get a code 12. Nothing else.

ok so no fault codes.

Customer: replied 1 month ago.
that's the way I see it.

pull the vacuum hose off of the fpr ans see if there is fuel present on it.

Customer: replied 1 month ago.
That's the vacuum hose behind and below the fuel regulator correct? If so, no fuel present.
Customer: replied 1 month ago.
One other thing that I failed to mention was that, the hunting starts after the engine has warmed up.

the vac hose was attached to the fpr correct?

Customer: replied 1 month ago.

ok, pull the egr valve off and clean crap out of it. also make sur its not leaking air around the base of the throttle body.

Customer: replied 1 month ago.
Ok, I'll get back to you.

okey dokey

Customer: replied 1 month ago.
Ok, I cleaned it up, no go. Still hunting and levels off then starts up again. No leak around the base of the throttle body. Can't find any air leaks anywhere. Its frustrating.

unplug the map sensor. see if it smooths out

Customer: replied 1 month ago.
Unplug just the wire plug? How about the vacuum hoses?
Customer: replied 1 month ago.
Did both, no change
Customer: replied 1 month ago.
Hello David, I think we've tried everything possible from your expertise. I'd like to thank you, for what you've taught me. How do I pay you for the help? I'd like to pay the full amount, cause I learned a few things. Thank you again. I'll use you again with any other problems that come up.
Larry

sorry for the delay larry. had to go to hospital . had a mini stroke. sorry we cant figure this out. please accept the answer and leave a 5 star rating for me if you were satisfied with my help. thanks my friend. take care.

ill be ok. just have to quit smoking

Customer: replied 1 month ago.
Please do, and I most certainly will.

thanks my friend

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