C4 Starting Issues
Thread Starter
8th Gear
Joined: Aug 2015
Posts: 8
Likes: 0
C4 Starting Issues
My1989 C4 stopped cold 6 years ago while driving. Towed it home. I'm a good mechanic with a lot of tools. No codes, replaced fuel pump, relay and filter. 40psi at the rail. Replaced all distributor components, plugs, wires. Tried a different MAF and computer. New battery. Checked timing, OHMS at the injectors and all ground straps. This summer it started five days in a row, would run for 4-5 minutes and then die. Now, tries but will not start. Most of my hair is already pulled out.
Team Owner
Joined: Jul 2004
Posts: 28,331
Likes: 3,245
From: Hartford WI
My1989 C4 stopped cold 6 years ago while driving. Towed it home. I'm a good mechanic with a lot of tools. No codes, replaced fuel pump, relay and filter. 40psi at the rail. Replaced all distributor components, plugs, wires. Tried a different MAF and computer. New battery. Checked timing, OHMS at the injectors and all ground straps. This summer it started five days in a row, would run for 4-5 minutes and then die. Now, tries but will not start. Most of my hair is already pulled out.
HOWEVER, why is it not starting? ASSUMING you have a good fuel pump, you should be getting 40+ psi at the rails when you are doing a WOT run IN GEAR. That will show us that the pressure is holding up under load.
So, when it doesn't start, did you check spark and fuel pressure?
Thread Starter
8th Gear
Joined: Aug 2015
Posts: 8
Likes: 0
As I indicated in my message, "This summer it started five days in a row, would run for 4-5 minutes and then die"
It ran well on all 8 cylinders, meaning that timing, fuel PSI, injectors, etc., are working as they should. It tries to start, but can't quite make it.
It ran well on all 8 cylinders, meaning that timing, fuel PSI, injectors, etc., are working as they should. It tries to start, but can't quite make it.
Team Owner
Joined: Jul 2004
Posts: 28,331
Likes: 3,245
From: Hartford WI
Meaning it RAN like it should. Till it didn't.
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