Join Date: Mar 2010
Location: Billings, Mt
Thanked 9 Times in 5 Posts
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Bad injector pump symptoms?
Cool story, bro.
But please bear with me.
The other day it was hot, 100+.
After 20 minutes of normal driving, I parked it and went inside. About 35 minutes I left again. The truck took about 5 seconds of cranking to start, normally I bump the keyswitch and it fires right up.
I get going down the road and the truck dies. 20 seconds of cranking, it fires up. The rpms go up and down about 200 rpm then smoothes out. I pull back out into traffic, push the clutch down to shift, the truck dies again. Repeat, starting 20 seconds of cranking truck fires up. Open the hood while it is idling, I hear a loud clacking from the front of the injector pump. Fuel pressure regulator?
I decide to take it home. I get going down the road, go to shift, and the rpms shoot to 4k. I shut engine off immediately. Restart it again, truck acts the same as before - hard to start and rpm fluctuates, then smooths out.
I am baffled as to what is going on. It acts like it's running out or starving for fuel, then the engine races to 4k. I replaced the lift pump, fuel pressure regulator and all rubber lines with marine hose last year.
I haven't been able to duplicate this problem again, as its only been about 80 ish outside. I want to get a fuel pressure gauge on it when it's acting up, but it hasn't since.
I saw on this site about warped injector cups on 94/95 trucks. Could the extreme heat cause this problem?
What are the symptoms of having warped cups?
Anybody have this problem?
1995 2500 4X4 5 speed 195000 miles DDP stg 2, #5 fuel plate, 15.5*, 4 GSK, 60#, TST AFC spring kit, KDP killed, BHAF, Valair clutch, 4 inch turbo back exhaust, ISSPRO guages boost and exh temp.