Author Topic: New problem after fixing my hesitation (Read 8136 times)

91 318i · « **Reply #15 on:** May 08, 2013, 06:43:30 PM »

Still waiting on the o2 to come in but in the mean time I found a spare icv that I cleaned and swapped in. What's odd is its a different part number but the same part. It's a straight through Bosch icv with a 2 wire plug. Identical to the one I had originally just a different part number. Both are Bosch. Both look the same.

Anyways. We'll see what happens with this quick little swap out. I also wrapped any possible vacuum leak suspect entirely with electrical tape. Which looks extremely ghetto but its easier than finding a replacement part for a quick test.

91 318i · « **Reply #16 on:** May 14, 2013, 08:10:11 PM »

New o2 sensor in. Still have a check engine light. Took apart the intake manifolds and siliconed between all mating/gas keying surfaces to ensure no chance of a leak. Still check engine light.

While I had the intake apart I noticed oil residue from the PVC hose in my intake. It was in the manifolds and the rubber intake hose and a little in the afm. I'm currently running 10w 30 synthetic. I know the factory recommends 15w 50 synthetic. Will that cause a rich/lean check engine light?

Another question is whether or not a messed up exhaust manifold gasket could cause this. I know when I was installing the motor i got one of the gaskets stuck and it got terribly bent up. I ordered new gaskets for that already but was wondering if a leak there would cause this light.

colin86325 · « **Reply #17 on:** May 15, 2013, 07:35:39 AM »

That oil should be fine. I use 5w30 in winter and 10w30 in summer. A bit of oil residue in the throttle body is normal, though I haven't seen it in the AFM. I suppose it accumulated and ran downhill.

A leaky exhaust gasket (or hole in your exhaust, upstream of sensor) can fool your O2 sensor and might trigger an error code.

91 318i · « **Reply #18 on:** May 15, 2013, 10:25:56 PM »

Okay. If this doesn't work I'm just gonna block the opening so I don't see the light anymore

91 318i · « **Reply #19 on:** May 18, 2013, 12:20:50 PM »

Manifold gasket didn't resolve it but at least have no more leak and my #1 exhaust port isn't blocked off about a quarter of the way

91 318i · « **Reply #20 on:** May 18, 2013, 12:44:29 PM »

Manifold gasket didn't resolve it but at least have no more leak and my #1 exhaust port isn't blocked off about a quarter of the way