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Old 03-30-2019, 09:48 AM
xy5jn0 xy5jn0 is offline
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Default Compression results help 94 4.0

Hi first post so I hope its in the right section.
94 Ford Ranger has no power and feels like its running on 5 cylinders. Put new plugs in, seemed to help for a couple weeks. Tried new wires, no improvement. Spark in all 6 cylinders.
Just ran a compression test. The results are as follows:
1- 175 lbs
2- 155 lbs
3- 170 lbs
4- 150 lbs
5- 130 lbs
6- 170 lbs

What does anyone think?

5 definitely seems to not affect engine idle when I pull the wire off.

Thank you for any help/suggestions.



Sent from my LG-H700 using Tapatalk

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Also have codes 172 and 176 if that helps.

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Old 03-31-2019, 06:42 PM
crowdpleazer crowdpleazer is offline
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Posts: 533
Default Re: Compression results help 94 4.0

If when you pull the plug wire off #5 and the idle doesn't change at all, you have a dead cylinder. Could be a bad coil pack, bad wire, bad spark plug, bad injector.

That low compression has me a little puzzled. 130 is a bit low but it should at least fire and you would notice a change when you pull the wire off. You may have more than 1 problem. Either way, low compression is almost likely a mechanical issue. Bad valve, piston ring, head gasket, etc, and would be the main issue.
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