HELP! Issues after LS6 intake install
10-02-2010, 07:55 PM
#1
HELP! Issues after LS6 intake install Just got done with the ls6 manifold install. Started the car up, sounds fine but the tach is dead. It moves off the resting pin but doesnt work after that. I took the car up to a good amount of RPMs, and it runs fine. Shut the car off, start it again and it works Shut it off, try it again but this time it backfires big time out the exhaust after not starting. Try again, starts fine. Try again,, won't start, small backfire. We repeat this process with it starting and not starting for a while, with the only lead being that when we play with the clip going to the fuel pressure regulator, it starts every time. Other than that its hit and miss, but car drives fine once started.
Can anyone help with these issues?
-Dead tach
-Starting inconsistently
Can anyone help with these issues?
-Dead tach
-Starting inconsistently
10-03-2010, 12:46 PM
#3
That's the thing, I am throwing some for the rear o2 delete and I think the EGR, both from when I did the headers so those are nothing new. I need to run over to a friends house to get them check this morning after work.
Here is what a friend told me, and it makes sense to me to be the crank position sensor:
Here is what a friend told me, and it makes sense to me to be the crank position sensor:
I don't remember if it is the crank or cam think it's the crank that feeds your rpm gauge. The PCM cannot tell engine position without the crank sensor but it does know when the piston is at TDC (via the cam position sensor) just not if that is the power stroke or if it's the end of the exhaust stroke, so the pcm will try different combos till the engine fires off then it just runs off the cam sensor, going in firing order in degrees because it knows that in the memory of the pcm. The times it starts is the pcm getting lucky lol Should be a code for a crank sensor if thats the issue
10-03-2010, 01:57 PM
#5
10-03-2010, 07:44 PM
#8
Turned out to be the crank position sensor, which is next to the OPSU. The pictures we used to compare looked alike, but I guess ti still could have been the cam pos. sensor. Either way, it was unplugged inadvertently and car starts and runs great now, with the tach working again.
