C4 spark testing
This may sound dumb but I bought a 1990 C4 that didn't start. Ok they told me it has water damage and was totaled. When I looked into it the water damage was minimal but the engine had thrown a rod. How do you throw a rod parked at the Beach?? Anyway after a rebuilt engine I've gone through most of the electronics, new ECU, relay's, distributor cap roter wire's +. The engine will crank over, fuel pressure up, but won't start? I've tested voltage to the ECU the Fan's come on the vats light goes off when cranking but have no spark, checked all fuses (twice) in line fuses (twice) power to the distributor cap.
I don't know what else to check, is there something I've missed?? |
Originally Posted by Brent Higginbotham
(Post 1596340484)
This may sound dumb but I bought a 1990 C4 that didn't start. Ok they told me it has water damage and was totaled. When I looked into it the water damage was minimal but the engine had thrown a rod. How do you throw a rod parked at the Beach?? Anyway after a rebuilt engine I've gone through most of the electronics, new ECU, relay's, distributor cap roter wire's +. The engine will crank over, fuel pressure up, but won't start? I've tested voltage to the ECU the Fan's come on the vats light goes off when cranking but have no spark, checked all fuses (twice) in line fuses (twice) power to the distributor cap.
I don't know what else to check, is there something I've missed?? |
You didnt mention the ICM in the distributor. Is it good? Did you have it tested? How deep did the water get?
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time to dig out the FSM. start with the basics. question - how are you checking for spark?. :rock:
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You sure all your grounds got reattached?
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Originally Posted by Brent Higginbotham
(Post 1596340484)
This may sound dumb but I bought a 1990 C4 that didn't start. Ok they told me it has water damage and was totaled. When I looked into it the water damage was minimal but the engine had thrown a rod. How do you throw a rod parked at the Beach?? Anyway after a rebuilt engine I've gone through most of the electronics, new ECU, relay's, distributor cap roter wire's +. The engine will crank over, fuel pressure up, but won't start? I've tested voltage to the ECU the Fan's come on the vats light goes off when cranking but have no spark, checked all fuses (twice) in line fuses (twice) power to the distributor cap.
I don't know what else to check, is there something I've missed?? |
C4
Originally Posted by bjankuski
(Post 1596347767)
Pull the code and see what the computer is telling you. Since the fans come on when you turn the key that means there is a trouble code. Hopefully that can point you in the correct direction.
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Does it start if you give it a sniff of gasoline in the air intake? If it turns over. Your problem is fuel delivery. Don’t assume spark. Try and eliminate the cheap stuff. Spark is super tricky. What code did you say you got?
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