DaffyXJ
NAXJA Member #929
- Location
- southern MD
A buddy of mine just stroked an 89 XJ renix motor and stuffed it into his CJ-5. It idles fine, perhaps a little rich for the first few minutes with a dumb computer, but settles down. vaccum is good, advance is good, timing is @12 TDC. Problem is when it is advanced above idle. Just won't run for dog $hit. I spent a solid 9 hours over 2 days going through this engine. Redid the lower end, upper end, metered all the ECU connections, tested all the sensors. Even replaced the ones we couldn't prove. ie TPS and O2.
Question is: When he modified the bell housing to fit the CKPS, it ended up installed approx 1/8th - 1/4 inch lower on the bell housing than stock. Would the fact that the ckps is lower on the bell housing and hence seeing the pickup notches sooner than normal contribute to the appearent (sp) miss fire above idle? It seems intuative that the smaller circle would result in a faster signal input to the ECU, hence a quicker firing of the injectors when we have an open valve based on camshaft position. Just looking for a check on my thinking.
D.
Never Mind: As an edit. He located the CKPS 1/4 inch over on the radius of the bell housing, not vertically down the bell housing. As I understand the pickups to operate, the orientation of the sensor around the circumference of the bell housing will not matter, as the crankshaft position is determined by the one larger pickup size over the others, creating a longe pulse wave.
Question is: When he modified the bell housing to fit the CKPS, it ended up installed approx 1/8th - 1/4 inch lower on the bell housing than stock. Would the fact that the ckps is lower on the bell housing and hence seeing the pickup notches sooner than normal contribute to the appearent (sp) miss fire above idle? It seems intuative that the smaller circle would result in a faster signal input to the ECU, hence a quicker firing of the injectors when we have an open valve based on camshaft position. Just looking for a check on my thinking.
D.
Never Mind: As an edit. He located the CKPS 1/4 inch over on the radius of the bell housing, not vertically down the bell housing. As I understand the pickups to operate, the orientation of the sensor around the circumference of the bell housing will not matter, as the crankshaft position is determined by the one larger pickup size over the others, creating a longe pulse wave.
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