Engine will not Idle?

Tiny
SW44241
  • MEMBER
  • 1995 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 11,200 MILES
Engine won`t Idle when I put it in gear, Shuts down and then its hard to restart. I thought it was a vaccum hose that came off. But I found nothing. Also I changed the cap, rotor, wires and plugs about 3 monthes ago. And had a new gas tank, sending unit, gas lines and filter replaced about 4 monthes ago. Only thing else I can think of is the EGR Valve. What do you guys recomend? Thankyou
Friday, January 22nd, 2010 AT 7:24 PM

26 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
A vacuum will cause this these guides can help us fix it.

https://www.2carpros.com/articles/stall-at-idle

Please run down this guide and report back.
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Wednesday, November 25th, 2020 AT 8:07 AM
Tiny
CLAIRE
  • MEMBER
  • 1 POST
  • 1995 CHEVROLET TRUCK
My problem is this:
My car seemed to be running and driving fine when I left work yesterday, got it on the highway home and still all was good. As I took the exit off the hwy and came to a red light, I put the brakes on and the car shook and died. I put it in park, started it but as soon as I put it in drive it stalled again. It runs fine in park, reverse and neutral but stalls immediately when engaged in drive, first or second. I even tried having one foot on the brake, revving the engine with the other foot and throwing it in gear. That didn't work.
Can you give me some ideas as to what the problem may be and an approximation of how expensive it will be to fix.
Thanks in advance :)
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
RODNEY025
  • MEMBER
  • 3 POSTS
It sounds like it might be the tcc solinoid. You could try unplugging it. I think it is located on the driver side of the transmission toward the front. Had same trouble with a Berreta. That fixed it.
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
DAKDAW
  • MEMBER
  • 1 POST
  • 1995 CHEVROLET TRUCK
  • V8
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
When we put engine in gear it stalls and shuts down
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
It sounds like a vacuum leak but to be sure this guide can help us fix it.

https://www.2carpros.com/articles/stall-at-idle

Please run down this guide and report back.
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
USMC7998
  • MEMBER
  • 2 POSTS
  • 1995 CHEVROLET TRUCK
I have a '95 Chevy Z-71, 5.7 v-8, with approx. 187,000 miles on it. My problem is that it keeps wanting to die when idling and when I come to a stop. It won't do it all the time and it doesn't matter if it is hot or cold. Always starts back up then dies again when I come to another stop or when idling. Already replaced: TPS, IAC valve, distibutor, distributor cap and rotor, plugs, fuel pump, fuel filter, cleaned throttle body, reset timing, new computer. I think that's all. I've done alot to it, and it's still acting up. I've had 8 mechanics look at it, and they can't figure it out either. All ground wires are good as are the wires in the ignition. At wits end! Help!
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Sounds like a vacuum leak. Replace the PCV, then get a can of spray gumout, have someone help you keep it running, then spray around the intake manifold, brake booster and vacuum lines, when the motor changes speed, you found the leak
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
USMC7998
  • MEMBER
  • 2 POSTS
We have done all those things. No leaks. Still acting up!
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
POWER GIANT
  • MEMBER
  • 1 POST
  • 1995 CHEVROLET TRUCK
  • 7.2L
  • V8
  • 4WD
  • AUTOMATIC
  • 25,000 MILES
Engine won't idle. OBD1 codes 43 and 71.
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There is no code 71 ther is 72 which is vss or speed sensor on trans. Code 43 is knock sensor but need to know if one or two testing is different.
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
JZIGGYP
  • MEMBER
  • 5 POSTS
  • 1995 CHEVROLET TRUCK
My chevy pickup starts then stalls ---runs very rough and stalls----i cant even put it in gear (automatic transmission) it stalls---i have to pump the gas to keep it running at all and it is extremly rough and still stalls ---when it stalls it appears to make a hard air sucking noise----i have checked the codes and have replaced the map, oxygen sensor, tps, iac sensorsi cleared the codes and retested and it only shows the code 12 nowi checked for bad or contamination in the gas --appears ok---i replaced the plugs wires cap and rotor less than a year ago----what could the problem be help please before this thing breaks the bank :oops:
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
BOB77
  • MEMBER
  • 26 POSTS
It sounds like you have a clogged fuel filter [most likely] or you may have a vacuum leak around the throttle body or intake manifold. The fuel filter is under the box on the left side frame rail. Make sure you remove your filler cap and disconnect your battery before you start. This relieves the pressure in the fuel line. You could also check the torque on the throttle body mounting bolts. Should be 12 ft. Lbs. Hope this helps.
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
JZIGGYP
  • MEMBER
  • 5 POSTS
I checked and could not find a vaccum leak---and the fuel filter I had already replacedthe hard vaccum sound only happens when it stalls out.
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
BOB77
  • MEMBER
  • 26 POSTS
It really sounds like a fuel supply problem. Maybe a bad filler cap[too much vacuum in tank], pinched fuel line, or weak fuel pump? Do you have any way to check the fuel pressure? Should be 9-13 psi. Also there is a whole slew of other sensors. If all else fails, get it plugged into a diagnostic computer to be sure.
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
JZIGGYP
  • MEMBER
  • 5 POSTS
After replacing the iac sensor. Map sensor. Oxygen sensor, fuel regulator and injectors on the tbi, fuel filterit still did the same thing---the sensors where replaced by testing and retrieving the codes----codes 12, 22, 32, 33, 44---which lead me to replace those sensors. And still not getting any results except that the codes nolonger came up with the replaced sensors ----then I did another code test and a new code came up code 54----didnt show up on any previous tests, FUEL PUMP :o --i replaced the fuel pump in the gas tank and then it wouldnt start at all---so apart it came again to recheck the instalationneither old or new pump would run when I tried to bench test it ----so I got discouraged and just left the new pump in and put it all together again---ouch bleeding profusley from my knucle busted hands ----all connections wwere properly connected the first time and the second time---to my suprise it started after reinstalled and runs greatmust be the truck gods dont like me :twisted: ----well at least im up and running again ---thanks for the help :D
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
BOB77
  • MEMBER
  • 26 POSTS
Good to hear you got it sorted out. I'll keep my fingers crossed for ya. Hopefully it's all smooth sailing from here. :D
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Wednesday, November 25th, 2020 AT 8:12 AM (Merged)
Tiny
SMALL12B
  • MEMBER
  • 2 POSTS
  • 1995 CHEVROLET TRUCK
I have a 1995 Chevy s-10 (170,000 miles) that won't idle when cold and runs rich.

Here's what I have done so far:

Changed the distributer, wires, plugs, rotor, cap, cooling temp. Sensor, idle air control, computer (but not the PROM chip), and coil. The fuel filter has been changed, there is no water in the gas and I have checked the ignition timing.

The spark coming from the coil to the cap is blue, but the spark coming from the end of the wire to the plug is orange. Also, I cannot pull an error code from the computer, I am getting a link read error instead.

When it does run, if it ever backfires when shutting off, it won't idle when started again. If it does start, I can bring the RPMs up, make it backfire, and it runs fine.

Any suggestions?
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Wednesday, November 25th, 2020 AT 8:13 AM (Merged)
Tiny
MCFERRANCE
  • MEMBER
  • 100 POSTS
Have you changed the fuel filter lately? Is there water in the gas? Have you checked ignition timing?
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Wednesday, November 25th, 2020 AT 8:13 AM (Merged)
Tiny
SMALL12B
  • MEMBER
  • 2 POSTS
The fuel filter has been changed, there is no water in the gas and I have checked the ignition timing.
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Wednesday, November 25th, 2020 AT 8:13 AM (Merged)
Tiny
MCFERRANCE
  • MEMBER
  • 100 POSTS
What engine is this?
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Wednesday, November 25th, 2020 AT 8:13 AM (Merged)

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