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1995 Ford Explorer blows compression thru intake

Tiny
MIKEY232323
  • MEMBER
  • 1995 FORD EXPLORER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 165,000 MILES
Changed pushrods rocker arms intake gasket no compression u take rocker arms off makes compression on 1 2 4 5 but 3 6 makes 25psi it died the other day and just free wheeled cranks turing cams turing in time im stumped
Saturday, July 31st, 2010 AT 5:49 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
It sounds like you have a valve that isn't seating or is bent. I was thinking headgasket, but they are on different banks. Before replacing the parts, was it running with good compression? Are you sure you didn't over tighten the rockers?
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Saturday, July 31st, 2010 AT 11:16 PM
Tiny
MIKEY232323
  • MEMBER
  • 4 POSTS
No it didnt run good had bad rocker arms they were pited out on the valve side also has new head gaskets on it just had a miss to it lifter tick rocker arms torque down so cant b over titend
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Saturday, July 31st, 2010 AT 11:21 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
If you are getting compression through the intake, I would have to say either you have two bent valves (intake valves) on those cylenders, or they are burnt and leaking.

Have you tried a "wet" compression test to see if the low compression is caused by worn rings? That wouldn't explaine the compression coming through the intake, but may be part of the problem causing the low compression.

Let me know.
Joe
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Saturday, July 31st, 2010 AT 11:25 PM
Tiny
MIKEY232323
  • MEMBER
  • 4 POSTS
Ill try it but it still dont make sense why it aint building compresion on frist four cly
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Sunday, August 1st, 2010 AT 6:10 AM
Tiny
MIKEY232323
  • MEMBER
  • 4 POSTS
Still nada no cracks in heads no burnt valves no bent vavles guides aint wore out would puttin 95 heads on a 94 block have anything to do with it if so why did it crank and run for a week nothings broke its in time the s**t dont make no sense done this stuff for 15 years now and aint never had no problem like this its mind blowing the joys of mechcanic work
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Sunday, August 1st, 2010 AT 9:47 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
There has to be a leak then. I'm with you, it doesn't make sense.

I looked up part numbers on the 94 and 95 cylender heads, and they are different. The 95 heads are over 1100.00 where as the 94 are around 400.00. I think that is where the problem is. The part numbers are totally different, and you can see by the cost, there is a big difference. NOTE: The cost I listed is from Mitchelonline and reflect the retail cost for OEM parts.

If I had to guess, I would say the heads are the problem.

Let me know if you find the same thing. Call a dealer and see what they say.

Joe
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Sunday, August 1st, 2010 AT 9:45 PM

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