a surging engine
Thread Starter
5th Gear
Joined: Sep 2012
Posts: 5
Likes: 0
a surging engine
Hi I just joined this forum with J&D thanks for the welcome.
I have a problem, I just bought this c4 on sunday and now the engine is surging while at an idle and sometimes cut off.
Can anyone help me out and tell me what the problem might be? Thanks Storm.
I have a problem, I just bought this c4 on sunday and now the engine is surging while at an idle and sometimes cut off.
Can anyone help me out and tell me what the problem might be? Thanks Storm.
Instructor
Joined: Sep 2012
Posts: 141
Likes: 1
From: San Clemente CA
When I got my 91 C4 it ran ok power but rough idle and engine surged at idle. After about a year of weekend driving I moved 5 hours away and on the drive to my new city, it died about half way there. Did not have my tools so I took to dealer, $2K later they got it running, but very poorly.
Advice from the forum was to check the resistance across the injectors. One was open circuit and one was a short. I replaced the injectors and the car runs great. Check my post "The Adventure Begins - C4 Help".
Lots of good advise on this forum.
Advice from the forum was to check the resistance across the injectors. One was open circuit and one was a short. I replaced the injectors and the car runs great. Check my post "The Adventure Begins - C4 Help".
Lots of good advise on this forum.
Last edited by wdsj; Sep 28, 2012 at 06:36 PM.
Racer
Joined: Apr 2001
Posts: 433
Likes: 0
From: Gig Harbor WA
Same problem I just had. One injector's resistance was way too low and two others were borderline. Towed to repair shop where he found the bad injectors. He wanted $1100 for a new set of eight, installed. It wouldn't start for me to bring it home for repairs. I had him pull off the connector to the dead injector. It started right up and I got it home - but it still ran poorly on 7 cylinders (with two borderline injectors). But - it ran far enough.
I have a rebuilt set of injectors ordered plus gaskets. When I get them, my mechanic son will change them out. There is a video on Youtube showing the procedure step by step.
I have a rebuilt set of injectors ordered plus gaskets. When I get them, my mechanic son will change them out. There is a video on Youtube showing the procedure step by step.
Instructor
Joined: Sep 2012
Posts: 167
Likes: 0
From: Johnstown Penna
I am curious to know how you check injectors also... Not for my Corvette... For my Mom's 2000 S-10 Blazer... I have been chasing sensors, fuel pumps and filters, AIR pump hardware and all other different hundred dollar parts store adventures and it still runs like garbage... Only thing I haven't messed with is the injectors, so I figure why not?
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
HOW TO OHM CHECK A FUEL INJECTOR high impedance
http://www.youtube.com/watch?feature...&v=_g8PdrT0MCU
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http://www.youtube.com/watch?feature...&v=_g8PdrT0MCU
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Last edited by WW7; Oct 4, 2012 at 07:45 AM.
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