Join Date: Feb 2009
slicknick13 is offline
2.8 timing way off/failed emissions
So I went for an inspection today and failed all of my idle tests:
CO: limit 1.2, actual 8.88
HC (ppm): limit 220, actual 1059
2500RPM tests were good:
CO: limit 1.2, actual 0.01
HC (ppm): limit 220, actual 50
We poked around a little in the garage with the tailpipe still hooked up, cleaned the EGR, plugged the evap, pulled the PCV etc. with no change in the idle emissions.
Next step was to check timing, which was retarded by a long shot. We're talking like the timing mark is in the 3 o'clock position. At that point, I had to leave the shop.
Got the truck home, the distributor loosened, and the base timing wire unplugged with no change. Tried to advance the timing but it naturally won't even get close to the marks. Plugged the scan tool in to make sure all of my sensors were sending data, though I don't know what to look for on a lot of them at idle. Temp and everything was OK.
Any suggestions out there? I just can't fathom why that timing mark was so off unless the balancer ring slipped or something.
Truck runs fine, but is pretty rich at idle. I put a kit on the throttle body very recently, so it's all cleaned out.