1993 All Other Makes All Other Models Repair Question
93 Chevrlet 1/2 ton work truck with 4.3 liter
Souds like a vacuum leak, either around the intake or throttle body.
Make sure all hoses are routed right.
[quote="demearsjr"]Souds like a vacuum leak, either around the intake or throttle body.
Make sure all hoses are routed right.[/quote]
Ok. I have replaced the gaskets around the throttle body and double checked the placement of the hoses. All seem good. I started it last night with some success but when I let it stand for a few minutes and came back to start it again the backfiring returned. Any thoughts?
Do you have a reading on the oil pressure.
If it's reading high check the pcv hose first to see if it's clogged.
The PCV valve and hose are all ok. I read in the manual that the distributor must not even be off by one gear and I suspect it is. Would this cause this type of backfiring due to crankshaft or camshaft positions sensors?
That could cause it.
Ok! Here is what solved the problem. The book calls for the alignment of the indent on the bottom of the distributor gear to be in alignment with the arrow and a 6 that is cast into the casing. This does not exist but it does have a 23 over a large X so I gambled and aligned up these marks. The book also shows that the number one spark plug must face toward the front of the vehicle which is what I did. Woo Hoo!!! It started great and runs perfect.
Thanks for the help. I know now that to be exact is most important.