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Engine idols fast

Tiny
CAJUNGUY1965
  • MEMBER
  • 1995 CHEVROLET S-10
  • 2.2L
  • 2WD
  • MANUAL
  • 204,000 MILES
My 1995 Chevy s10, 2.2 ltr engine idols extremely fast. While driving, it almost dies out. I lose speed and power. I have changed fuel pump, fuel filter, one fuel injector(because it cracked while checking connections). I can't see any vaccumm leaks. It's a 5 speed manual transmission. Truck was running decent until I changed fuel filter. Then fuel pump wasn't pumping proper pressure to keep truck running. I am puzzled. I even changed throttle position sensor. It still does the same thing. Anyone have any idea what can cause this? I need to repair as soon as possible.
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Wednesday, January 13th, 2016 AT 11:15 AM

9 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try cleaning throttle plate on both sides and iac hole with choke cleaner. Then check for vacuum leaks as well as holes in duct work
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Wednesday, January 13th, 2016 AT 12:03 PM
Tiny
CAJUNGUY1965
  • MEMBER
  • 39 POSTS
I have already done that. Same result
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Wednesday, January 13th, 2016 AT 12:05 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure with a gauge then if a 4 cyl 41-47 psi auto parts rent it. If you replaced fuel filter make sure it is on correctly.
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Wednesday, January 13th, 2016 AT 12:09 PM
Tiny
CAJUNGUY1965
  • MEMBER
  • 39 POSTS
Fuel pump is new. So is fuel filter. Had old pump checked. It wasn't putting out proper pressure so I changed it. I don't have a scan tool. I been trying to figure what is causing this
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Wednesday, January 13th, 2016 AT 12:12 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Auto parts can scan most engine problems. However normally it's a vacuum line off/cracked etc or hole in duct work leading to engine or grommets on engine.
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Wednesday, January 13th, 2016 AT 1:07 PM
Tiny
CAJUNGUY1965
  • MEMBER
  • 39 POSTS
Parts places can not scan 1995. It is a year too old. Mine has a bd1 system. Parts places can not scan bd1 system. Only bd2 system in general motors. I will continue to look for vaccumm leaks. But haven't found anything yet
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Wednesday, January 13th, 2016 AT 1:13 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Also, check the idle air control motor on the throttle body. It controls idle speeds

Roy
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Wednesday, January 13th, 2016 AT 2:50 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If it's obd 1 use a paper clip on

A & B on aldl and turn key on it will flash light count flashes get back to us if it just does 12 then that means the system is working ok
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Wednesday, January 13th, 2016 AT 3:17 PM
Tiny
CAJUNGUY1965
  • MEMBER
  • 39 POSTS
I have found the vaccumm leak. It's on the main air intake. Need to change the gasket. Thanks a lot for your help and expertise.
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Thursday, January 14th, 2016 AT 10:46 AM

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