98 LS Integra idles in columns 4-5. What gives?

ocd · Post by **ocd** » Fri Jun 23, 2006 6:44 pm

This car has been in and out of the shop w/ head gasket related problems. Last tune everything was perfect. Now we're retuning the same map as before, the engine will only idle in columns 4 and 5, sometimes 3 and 4.

The engine is B18 non vtec, 8.5:1, crower turbo cams, skunk2 intake mani, air research turbo (unsure, but smallish), MSD SCI, MSD Blaster 2 Coil, RC 650cc, and nothing out of the ordinary. The tps is @ .488v fully closed and 0% on the ROM editor software. TP% reads 99% at WOT. The car has an enlarged OE throttle body (minimal boring). Base ign timing is set at 15btdc. There are no other changes that I am aware of.

Are there any common causes for this?

ocd · Post by **ocd** » Mon Jun 26, 2006 7:35 am

Well, I think it has something to due with vacuum at idle and these cams. It's funny though. We tuned on these cams before and didn't have this problem at that time. I'm gonna put some more vacuum on the MAP sensor and see what happens to the highlighted cells at idle.

Post by **Spunkster** » Mon Jun 26, 2006 10:21 am

Have you done a leakdown and compression test?

ocd · Post by **ocd** » Mon Jun 26, 2006 11:06 am

No leak through or compression tests yet. I'll post the updates. Thanks!

ocd · Post by **ocd** » Wed Jun 28, 2006 12:16 pm

At 24 inches of vacuum with a tester/pump, the highlighted cells move into the 1-2 columns. At idle and cold, the engine only produces only 17 inches. Warmed up, the engine produces about 15 inches.

I think I found the problem.