bad idle at stop lights...
Thread Starter
Advanced
Joined: Jan 2008
Posts: 97
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bad idle at stop lights...
1991 L98 26,550 miles... It seems like a misfire.
I changed the plugs,wires,cap,rotor,gas filter and module. It still has a intermittent spark issue? It shakes and surges only when its hot. (in drive at an idle) No problem WOT. It does the same thing in park or neutral. But its more noticeable in drive. I Checked the timing. Good.
My friend pulled each wire off while at an idle in drive. He said sometimes there was no difference when he pulled the wire off.
Whats left the coil?
this is a pain in the ***.
any help would be greatly appreciated thank you.
I changed the plugs,wires,cap,rotor,gas filter and module. It still has a intermittent spark issue? It shakes and surges only when its hot. (in drive at an idle) No problem WOT. It does the same thing in park or neutral. But its more noticeable in drive. I Checked the timing. Good.
My friend pulled each wire off while at an idle in drive. He said sometimes there was no difference when he pulled the wire off.
Whats left the coil?
this is a pain in the ***.
any help would be greatly appreciated thank you.
Advanced
Joined: Apr 2007
Posts: 72
Likes: 0
From: Greenville SC
It is your lovely Multec Fuel Injectors. Mine is doing the exact same thing and I am getting ready to replace them so i can enjoy my car this summer. My car has 90k on it so you can imagine how bad it is. It has actually died a couple of times. My suggestion would be to OHM them out to see how bad they are.
Intermediate
Joined: Apr 2008
Posts: 44
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problem?
i am going the same thing here! ive done the cap, rotor, plugs, wires, and coil, and ive checked for vaccuum leaks. ive been told to check and clean the Idle Air Control, so thats next on my list. im gonna also check the injectors because it seems to be the consensus on this page! you are not alone!
Intermediate
Joined: Apr 2008
Posts: 44
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mine is a 89 with 105k and runs like a CHAMP, but in drive, after it warms up, the idle fluctuates from 500 to 700 rpms, kind of pulsating. tomorrow im gonna check for engine codes and go from there. Next on the list, assuming no codes, are Idle Air Control and prayers!
Pro
Joined: Jan 2008
Posts: 584
Likes: 1
From: Near Lockport NY Black 1986 Coupe
Does it idle okay when cold or is it rough too? Usually when it misfires after warmed up it's the injectors - I'd bet my money on it. If it does when cold too, however, it may be a different animal altogether.
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From: Sandhills of North Carolina
Intermediate
Joined: Apr 2008
Posts: 44
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injectors? ? ?
mine idles great until it warms up and the idle settles below 800 rpms. than at stop lights, the fun begins. it is embarring because my vette is SUPER CLEAN and sounds mean with exhaust, then at the light the miss is ugly! is this a common problem? can i test the injectors? if the are bad, what are some upgraded injectors youd recommend? thanks!
