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engine miss 2000-3000 rpm

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  #1  
Old 06-14-2018, 05:04 PM
frankbuck
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Default engine miss 2000-3000 rpm

engine won't rev past 2k-3k. gas gauge doesn't work (low fuel light works). When I add fuel additive, revs higher for a while. same RPM limit in any gear. runs up to 80 mph, just can't get there very fast.

rotor/cap/wires look good, pump has been replaced before. 1994 5.2 2-wheel drive

my thoughts: fuel pump or collapsed fuel line (I'm in S. California, lots of ethanol).

Any help is appreciated!

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Old 06-14-2018, 06:31 PM
RalphP
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1994 - it should still have the frame rail mounted fuel filter; has it been replaced recently?

What kind of shape is the cat(s) on it?

RwP
 
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Old 06-16-2018, 12:56 PM
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Ralph, the 94 5.2 has an in-tank filter. Id look at eh cats too. I would think a fuel line collapse would cause lean condition and detonation.
 
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Old 06-16-2018, 08:56 PM
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Originally Posted by Snowman451 View Post
Ralph, the 94 5.2 has an in-tank filter. Id look at eh cats too. I would think a fuel line collapse would cause lean condition and detonation.
Yes it does.

And you're right, I was thinking 1992/1993 which still had the frame mounted filter. Also.

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Old 06-19-2018, 02:54 AM
frankbuck
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I looked at first post, didn't explain correctly (it was late).

Truck starts missing or acting like it's hitting a rev-limiter, When adding fuel treatment, revs a little higher for a while.

Truck just passed annual smog check and when I bang on cat, it doesn't make noise. I've replaced the cat two times before, and it was really noisy.
 
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Old 06-19-2018, 09:43 AM
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Failing crank or cam sensor. Maybe low fuel pressure?
 
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Old 06-20-2018, 02:29 PM
frankbuck
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Thanks for the reply. Already planning a fuel pump replacement (gauge doesn't work). Is there a way to test the crank or cam sensor?

Thanks.
 
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Old 06-21-2018, 09:06 AM
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Not without an oscilloscope.....
 
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