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Underbody braces, turbos and more!

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PostPosted: Wed Sep 09, 2015 12:49 am 
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Joined: Sat Oct 22, 2005 2:53 am
Posts: 28
Location: San Antonio Texas
I tested #1 cylinder at 168 lbs then got low pressure on #2 through #4. I then retested #1 and got 90 lbs. I removed the timing belt cover and verified that the timing marks are properly aligned. Why might #1 test okay, then a few minutes later test at only 90 lbs?

The P0300 code is set. The coolant level has remained full and the motor oil appears to free of coolant. The car has 149,000 miles and ran okay until this weekend.

I will recheck #2 through #4.


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PostPosted: Wed Sep 09, 2015 9:42 am 
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Joined: Thu Jul 20, 2006 7:17 pm
Posts: 1408
Location: Alberta, Canada
What was the initial problem? Just a check engine light with p0300, or did it run poorly suddenly?

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1995 Swift w/16V 4.39s, 3tech cam, Esteem t-body, Header, needs more.
1995 Gt Mustang "Boss Shinoda" package.
1999 F150 4x4 Supercharged
1967 Mustang 428 auto, never ending expensive project
1993 Civic si h22a, fell in my lap, couldn't resist!


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PostPosted: Wed Sep 09, 2015 10:28 am 
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Joined: Fri Aug 01, 2008 12:41 am
Posts: 170
Location: Oregon
Sounds like the crank key is failing. Take another look behind the bottom sprocket.

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PostPosted: Wed Sep 09, 2015 11:02 pm 
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Joined: Sat Oct 22, 2005 2:53 am
Posts: 28
Location: San Antonio Texas
I retested the compression using a dab of grease on the threaded fitting. It still reads 90 lbs on #1

#2 is 180, #3 is 160 and #4 is 170. The spark plug threads might be worn, but visually don't have missing threads. I could use some plug thread tape from NAPA - if not for the poor reading on #1. I will use some Teflon pipe tape on #1. If that improves the reading I'll get the tape from NAPA.

I'm sure that I found #168 lbs when I tested #1 on Sunday the first time.


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