RPM related missing problem
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Joined: Jan 2010
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From: Terre Haute, IN
RPM related missing problem
I've been fighting a missing problem thinking it was sensors or injectors. After realizing a few new symptoms i'm not so sure.
1) When cold if i start off in first and accelerate somewhat quickly to a high rpm and then let it coast and push the clutch in it will die. When i try to restart it, it sounds like it has no compression. After a few (30+) seconds it will start to pick up and eventually run again, though not on all cylinders.
2)At any temp if i get above ~3000rpm when i shift it will start missing. It is rare for it to not do this.
I'm really confounded by #1, and i'm sure its what causes #2. I've got about 218xxx miles on it, and i'm not sure the timing belt has ever been replaced.
Could the belt be doing something funny when slowed down after high rpms? Why does the truck sound like it loses compression, but then after several seconds of cranking it will start to fire again (usually one cylinder at a time)?
1) When cold if i start off in first and accelerate somewhat quickly to a high rpm and then let it coast and push the clutch in it will die. When i try to restart it, it sounds like it has no compression. After a few (30+) seconds it will start to pick up and eventually run again, though not on all cylinders.
2)At any temp if i get above ~3000rpm when i shift it will start missing. It is rare for it to not do this.
I'm really confounded by #1, and i'm sure its what causes #2. I've got about 218xxx miles on it, and i'm not sure the timing belt has ever been replaced.
Could the belt be doing something funny when slowed down after high rpms? Why does the truck sound like it loses compression, but then after several seconds of cranking it will start to fire again (usually one cylinder at a time)?
Thread Starter
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Posting Guru
Joined: Jan 2010
Posts: 1,665
Likes: 4
From: Terre Haute, IN
Results from compression test, engine warm, each reading done twice:
Cyl 1- 190 psi
Cyl 2- 185 psi
Cyl 3- 195 psi
Cyl 4- 190 psi
Chiltons says highest must be within 15 psi of lowest, 100 psi minimum.... no spec stated....
Cyl 1- 190 psi
Cyl 2- 185 psi
Cyl 3- 195 psi
Cyl 4- 190 psi
Chiltons says highest must be within 15 psi of lowest, 100 psi minimum.... no spec stated....
