Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
If there is a crack on the exuast manifold on my 94 GMC Jimmy would that make my 1,3,5 cylinders weak?
I went to smog my Jimmy and it didn't pass, to much co. Checked the EGR, Did a smoke test on the intake manifold and the tank test passed, all good. We did a cylinder test and 2,4,6 were good but 1,3,5 were not so good. Um there is a crack on the exuast manifold on the 1,3,5 side and was wondering if that would have anything to do with it. I also used that Guaranteed to pass smog formula. Any advice hope this makes sence
4 Answers
- 1 decade agoFavorite Answer
The crack could make your cylinders weak because not all the exhaust is leaving the cylinders properly throwing off the air fuel ratio and the compression as well. You might as well replace the exhaust manifold.
- ?Lv 71 decade ago
A cracked exhaust manifold will not affect a motor's compression but it will affect the emissions of the truck. This usually affects the oxygen sensor as there will be extra oxygen being allowed into exhaust so you will get a bad reading. Too rich I think.
Source(s): I was a GM mech for years. - 1 decade ago
A leak in your exhaust won't affect your cylinder compression which is what I'm guessing you are you referring to. If you have weak compression on that whole bank you have some major problems, good luck.
- Anonymous1 decade ago
The cracked exh. manifold can cause cool air to touch the exh. valves & YES this can cause them to warp / bend. Then they won't seat well. To repair it you can put a rebuilt head on'er,or do it yourself. It isn't hard to tap in new guides & seat(turn) new valves. =^ )
