Can a clogged exhaust cause low compression?
I have a 97 Ford Expedition. Recently I was rear ended and the car actually hit my dual flow master exhaust system. Shortly after my check engine lit came on. Upon checking the system I have low compression on the #2 and #5 cylinder. Could the low compression have something to do with the impact? For instance the jar to the system making the carbon in the pipes to settle and block the exhaust?
Answers & Comments
Verified answer
A clogged (or bent shut) exhaust can cause low compression, but not on just 2 cylinders (not on that vehicle at least, unless maybe you have headers?), and certainly not from "carbon in the pipes". Short of you having 2 header pipes that are collapsed, the best way to find out for sure why you have the low compression would be a cylinder leak-down test.
As an example, a friend of mine bottomed out his car real bad years ago, and squished a bunch of his header tubes. It ran terrible until we got that fixed. Didn't bother with a compression check, since it was pretty obvious. But I'm sure it would not have been good! LOL
replace the cracked EGR first. For shadetree mechanics available, while you're a one hundred pc particular an element is broke replace it before changing the rest, or proceed to diagnose issues. in the experience that your EGR is cracked, you have the two a vaccum leak, and air leak into the intake inflicting a lean misfire. start up here reset the codes, andcontinual it.
It should not have hurt your engine. It could have damaged an O2 sensor. Then again, it could put back pressure on your motor and that could eventually damage your motor.
Listen to the guy below me.
i never heard of that that would just a cause more back pressure may be you have something else going on hope this helps