Engine compression reading and misfiring - Saab 9-3SS Bulletin Board - Saabnet.com
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Engine compression reading and misfiring
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Posted by Michel_DDO [Email] (#2328) [Profile/Gallery] (more from Michel_DDO) on Mon, 9 Apr 2018 20:29:16 Share Post by Email
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Hi, I have a 2006 2.0 liter SAAB automatic and 208 000km on the counter.
Two weeks ago, I saw the check engine light but the car was driving fine. My mechanic changed all four coils and checked my spark plugs and they were ok. But the engine light came on again but the engine was ok. I had a P0300 code, erased it and came back

One evening last week I started my car from work and the engine was misfiring all the way to home.
The only misfiring I had before was on the Highway and it started about 6 month ago. When I wanted to push hard there was misfiring. At normal speed it was running fine. I always use premium gas.

The misfiring is going on and off. Can drive for an hour and everything is ok then it will misfiring and then back to normal. Every morning at startup the car will misfire and will stay like that all the way to work or sometime it will settle by itself.

I have done plugs regapping, changed CPS, added injector cleaner, did an engine flush and put new oil.
Cleaned the MAF sensor. I have also checked for vacuum leak with the carburator cleaner on almost all the lines I could see but I may have forgotten some. The fuel pump was changed about three years ago when my fuel gauge died. Did a compression test, here the result.
Cold: #1:205 #2: 210 #3: 200 #4: 205
Wet: #1: 230 #2: 240 #3: 240 #4: 240
Warm: #1: 200 #2: 210 #3: 195 #4: 205
One thing I noticed, once the engine was off the pressure wasn't holding and started dropping. Is it normal?
What baffle me is it is not all the time. Mostly when the engine is cold but when warm it will be ok and it change a few minutes later and then back to normal.
Thanks!

->Posting last edited on Mon, 9 Apr 2018 20:36:28.
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