The exhaust is steady and no smoke. GOOD
Exhaust has miss, or runs rough you can feel pulse(lean misfire), and little smoke.
Exhaust is smokey and blue(oil), white(water, coolant), or black(rich fuel) and putting or chugging, problem. Yes a valve timing problem will cause either lean or rich putting. The lack of unusual smoke is good. Not the heat your feeling for, Its the rythmic pulse.
Out here we also use an exhaust analyzer to tell, high HC is miss(raw fuel). High CO is rich. Try spraying water or a little carb. Cleaner in, if it smooths out its too lean. Give it a little vacuum leak, if it smooths out for a second or two its rich. The vacuum test should be near 18 at idle. The MAP sensor needs 18 at idle. Or 17. Does turning dist. Make any difference?
Remember, the timing must be set in open loop(coolant sensor disconnected) or its retarded. By 20 degrees, so give it 15 degrees and if its better, thats what may have happened.
You can be a tooth off on the timing belt. It can be timed up or down to idle better, but will not breathe right. No power. If you feel exhaust pressure, the catalytic converter's not clogged.
New pads, new rotors, grease bearings, head gasket, all need attention. The police always grab your garbage first, if they are investigating someone. Doc. Looks at stools. Dogs sniff arse. It is a quick internal check of a driveability complaint to look at the exhaust. Without a compression test. Before testdrive. An oil change if its dirty, always helps a car. Helps seal rings. Bearings.
Ok Horizon man, no, no Omni man. Sorry
I get em mixed up. M, Z, L, body.
Monday, October 26th, 2009 AT 2:31 PM