TrOuBlE wItH mY eNgInE

[lever_John]

I have a cracked exhaust manifold, and once my manifold was loose at the pipe before the 1st cat. It has always been loose but the check engine light never came on. But during the last week I took 1 of the 2 studs out to get at my 02 sensor on the bottom of my exhaust manifold.... well I forgot to put it back in and my check engine light stayed on after the car had been run 5 mins then stayed on for about 15 mins and then shut off for a few mins and you get the point.... So it is the loose pipe. Also I decided to pull the codes while it was like this and I got a few warnings ... lean air/fuel mixture and EGR valve not functioning properly. I have quite alot of kilometers over 330, 000 kms so I decided to change my O2 sensor because over time they begin to function slower and not even trip a trouble code. Also don't waste your money on crack sealers because they do not work moree than 2 - 3 days I have tried 5 different ones including steely, hightemp steel, exhaust manifold repair etc... And you cant weld the damn things either unless you can get someone who knows how to relieve stress on the crack, install a screw, and then weld er back up... but I won't do it because I have heard that it does not last very long and that it is very difficult to do without cracking the cast iron manifolds even further.