rangrayy
OBS Enthusiast
Looking for some insight with some trouble codes and a shutter that started today.
1998 Silverado Z71 5.7 256,000 miles still factory from what I can tell/was told.
Step son was driving it today and sent me a message about the truck shaking when accelerating till about 60-65mph and some shaking at stops idling. Oil pressure was a constant 40 and temp was normal.
I drove it home and could not get the shake/hesitation at idle as stated. I went to pull out and it started stuttering and could feel it all the way up to speed(60ish). My first thought was okay that feels like a misfire or a fuel delivery issue. Had the same stuttering on our 95 with the v6 in it which made me think of possibly a misfire. On the 95 all it took was a rotor and cap replacement but I feel like the 98 is not going to be that easy of a fix.
After 10 minuets of driving it went away and drove smooth till I got home, about 15 more minuets later. Went back out and it stuttered for about 3 minuets and quit again. Shot over to Oreilly's and hooked up to the scan tool to see the codes I was sure that were thrown.
P0300- Multiple Misfire Detected
P0341- Cam Position Sensor B1
P0405- EGR Circuit Fault
P1345- Cam Position Sensor Correlation Confirmed
P1870- Trans Slipping
CYLINDER 5 MISFIRE
I already knew about the EGR code and not too concerned about that unless it is the culprit.
Google was little to no help and the SEARCH button ^^ lead to some but not enough help.
I recently replaced the lower intake gaskets and upper intake and had an issue reinstalling the distributor and did not line it up properly causing a very hard start and valve pinging once running and WOT. Simple fix of loosening the distributor and rotating a small amount clockwise until it went away. I know that the ECM can compensate some for the timing so I am wondering if the retaining bolt came loose and the distributor twisted some causing my misfire. While the distributor was off I did see some corrosion on the contacts so maybe time to tune up with cap, rotor, plugs and wires?
What other items should I be looking at? I am afraid this is going to be a trial an error repair. Any help or possibilities would be greatly appreciated. I am not very savvy with the computer controlled engines. My 87 was computer controlled but I deleted it and made life easier, the other car I have goes to the dealer because all the repairs are paid for so why bother messing with it and the headaches that ensue.
1998 Silverado Z71 5.7 256,000 miles still factory from what I can tell/was told.
Step son was driving it today and sent me a message about the truck shaking when accelerating till about 60-65mph and some shaking at stops idling. Oil pressure was a constant 40 and temp was normal.
I drove it home and could not get the shake/hesitation at idle as stated. I went to pull out and it started stuttering and could feel it all the way up to speed(60ish). My first thought was okay that feels like a misfire or a fuel delivery issue. Had the same stuttering on our 95 with the v6 in it which made me think of possibly a misfire. On the 95 all it took was a rotor and cap replacement but I feel like the 98 is not going to be that easy of a fix.
After 10 minuets of driving it went away and drove smooth till I got home, about 15 more minuets later. Went back out and it stuttered for about 3 minuets and quit again. Shot over to Oreilly's and hooked up to the scan tool to see the codes I was sure that were thrown.
P0300- Multiple Misfire Detected
P0341- Cam Position Sensor B1
P0405- EGR Circuit Fault
P1345- Cam Position Sensor Correlation Confirmed
P1870- Trans Slipping
CYLINDER 5 MISFIRE
I already knew about the EGR code and not too concerned about that unless it is the culprit.
Google was little to no help and the SEARCH button ^^ lead to some but not enough help.
I recently replaced the lower intake gaskets and upper intake and had an issue reinstalling the distributor and did not line it up properly causing a very hard start and valve pinging once running and WOT. Simple fix of loosening the distributor and rotating a small amount clockwise until it went away. I know that the ECM can compensate some for the timing so I am wondering if the retaining bolt came loose and the distributor twisted some causing my misfire. While the distributor was off I did see some corrosion on the contacts so maybe time to tune up with cap, rotor, plugs and wires?
What other items should I be looking at? I am afraid this is going to be a trial an error repair. Any help or possibilities would be greatly appreciated. I am not very savvy with the computer controlled engines. My 87 was computer controlled but I deleted it and made life easier, the other car I have goes to the dealer because all the repairs are paid for so why bother messing with it and the headaches that ensue.
