![]() ![]() ![]() Compression after head replacement is at 140. The m/shop did not have a favorable attitude towards Jasper.Īny ideas folks? I'm really frustrated at this point especially since it was running two hours ago perfectly. Both cylinder heads were a mess though with numerous warped/bent valves. If I keep playing with it it seems like cylinders are coming back on-line and then dropping out again. Attempts at starting now result in absolutely no power when it does start, won't respond to accel, backfiring. The crankshaft position sensor monitors the position and speed of the crankshaft and other parameters that play an important role when starting the engine. Truck was at a slight downhill angle so I'm wondering now if I'm also dealing with bad fuel. The most common symptom associated with a bad or failing crankshaft position sensor is difficulty starting the vehicle. The truck was running perfectly in the garage for 35 minutes, revving and idling fine.pulled it out to do a road test and revved a few times and blam, backfiring, won't idle. Set timing with light after disconnecting wire at dash and again timed to 0. Started and ran a little rough but not bad. ![]() Truck had been overheated several months prior and I assume it was HOT. egr pcv cleaned out all the throttle body. Background Grandson drove truck 75 miles to my place backfiring and barely running. Low idle slight stutter - 94 5.7 tbI I have replaced every sensor on motor. Put back together, checked cam timimg and set ignition timing to 0. 1994 1500 5.7 TBI (3 year old Jasper engine - 20k miles). Removed head.machine shop found valves warped badly:::bought two reman heads and installed. CTS was not grounded and apparently fuel-washed the veral shots of oil in cylinders brought compression back except for #1. Grandson drove truck 75 miles to my place backfiring and barely running. 1994 1500 5.7 TBI (3 year old Jasper engine - 20k miles). ![]()
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