1990 C4 stumble and rough running FIXED !
Thread Starter
6th Gear
Joined: Oct 2008
Posts: 6
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1990 C4 stumble and rough running FIXED !
Not sure if this is the right place in forum for this but here we go and hope this might help some others . Our 1990 C4 had been stumblling and running rough before it finally would not run very well at all . The engine was a L98 and still had the stock injectors from the factory . After reading the forums and checking for codes (there were none set) . I checked the wiring and firing with a set of noid lights which showed that the injector pulses were still working . I followed the advice of a lot of people here on the forum and called Joh Banner @ Fuel Injector Connection and ordered a set of the Bosch 3 injectors . To make a long story short . 
PROBLEM FIXED Thanks Jon and thanks to everyone at corvette forum .
PROBLEM FIXED Thanks Jon and thanks to everyone at corvette forum .
Team Owner
Joined: Oct 2000
Posts: 96,443
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From: Fort Knox, KY
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So, it was bad injector(s) even though the noid light showed all injector pulses were normal?
That was quite of faith to plunk down money on new injectors, but I'm glad you fixed the problem.
That was quite of faith to plunk down money on new injectors, but I'm glad you fixed the problem.
Instructor
Joined: Jan 2010
Posts: 174
Likes: 4
From: Austin_Palm Bay_Houston Texas_Florida_Texas
Post likes yours are very valuable, especially when the problem is ellusive, ie no error codes, noid light shows working injectors.....and BLAM.... a set of new injectors solve the problem. I suspect the the problem is that Noid lights wont tell you if you have a leaky injector or an injector that has poor atomization spary due to gummed up or worn out pintle.
Should be a mandate on CF that folks report the............."Final Solution" !!!
Cheers
-Al
Drifting
Joined: Aug 2010
Posts: 1,880
Likes: 4
From: Montgomery Texas
I also bought injectors from John last week ( 24# Bosh III ) and it fixed my car right up. He said that the ethonal in todays fuel ate up the inside of my old injectors. $300 dollars for injectors and the intake gasket set.
PS: my timming was also a little retarded so when we set it back to factory the car really came to life.
PS: my timming was also a little retarded so when we set it back to factory the car really came to life.
Instructor
Joined: Feb 2008
Posts: 177
Likes: 5
From: Toronto Ontario
Post likes yours are very valuable, especially when the problem is ellusive, ie no error codes, noid light shows working injectors.....and BLAM.... a set of new injectors solve the problem. I suspect the the problem is that Noid lights wont tell you if you have a leaky injector or an injector that has poor atomization spary due to gummed up or worn out pintle.
The solution to a problem is very helpful.
The solution to a problem is very helpful.
