Engine loses power at 2500 rpms - Defender Source
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  #1  
Old August 15th, 2010, 04:11 PM
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David Hazard
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Engine loses power at 2500 rpms

So I think this is a fuel pump issue but wanted to check here first.

When driving the defender, when I reach 2500 RPMs, the motor starts to bogg down and choke out very badly. It wont be able to go any higher in RPMs till I shift to the next gear which is fine till I reach 2500 RPMs again. Ive had this problem in my older jeeps and it always seems to be a fuel filter or fuel pump issue.

The only other thing I can think of is, I replaced the headlight switch and removed the steering column cover and Im wondering if I hit a wire or something in there? It wasnt doing that prior to the replacement.

Thoughts?
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  #2  
Old August 15th, 2010, 06:38 PM
jack SF
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jack baran
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Check fuel pressure and volume or just replace fuel filter.
Check wire, plugs, cap and rotor.
Replace ignition module.
Than once I had an alternator causing inerferance exactly at 2500rpm and car would not accelerate thru that.
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  #3  
Old August 15th, 2010, 09:11 PM
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Chris Robinson
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Could be the speed sensor under the drivers seat, along the frame rail.
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  #4  
Old August 15th, 2010, 10:56 PM
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Jason England
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If it's not fuel ... it could be air ... every 'fuel' problem I've had has been air related ... check the plenum pipes.
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  #5  
Old August 17th, 2010, 08:31 AM
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David Hazard
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Quote:
Originally Posted by crobinson View Post
Could be the speed sensor under the drivers seat, along the frame rail.

Go on...

What is this speed sensor you speak of?
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  #6  
Old September 3rd, 2010, 10:23 AM
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David Hazard
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Any other help on this guys? Still happening.

I drove it all week with no issues, ran perfect. Then yesterday, it wouldn't climb above 2500 Rpms again. Very intermittent problem. Like is said this whole problem started after I replaced the headlight switch in the steering column. Is there anything that I could have affected in there?
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  #7  
Old September 3rd, 2010, 02:12 PM
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I'd second the alternator suggestion. Get a new one like Ron said, NOT REBUILT FROM AUTOZONE. I had the exact same problem, it was the alternator, BP has like new ones for like 200 something. Good luck.
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  #8  
Old September 3rd, 2010, 02:42 PM
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Jake K.
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Another look!

Get the problem to start happening consistant and then pull the belt for the alt. or if serp driven then take the belt off and drive around the block and see if the problem goes away....if still there then it's not the alt! The TPS can get a flat spot in it and cause similar issues. Back-probe the TPS with 2nd ignition on and check the scaling of it. It should rise from almost zero up to around 5 volts at wide open.
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  #9  
Old September 3rd, 2010, 08:39 PM
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I had the exact same problem after taking my 90 for a swim. When I say "swim" the bottom seat cushions began to float.

I my quest to find the problem i messed with a bunch of things, but I'm 99% sure that it was a little water in a connector going to the MAF sensor. It wasn't the main MAF connector b/c that was the first thing I checked, but on a 94 at least, there is a little plastic connector just downstream from the main one. It had water in it, I cleaned it out and it has ran fine since.

Matt
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  #10  
Old September 17th, 2010, 06:34 PM
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David Hazard
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So here's the latest on this. I noticed when I turn on my headlights or blower motor (heater) the engine starts doing this. When I turn them off it runs fine?! Is this an alternator issue, or a wiring issue in the steering column?

Anyone had experience with this?
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  #11  
Old September 17th, 2010, 08:35 PM
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Bad diod in the alternator. I had the same problem. New alternator fixed the problem.
Good luck.
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  #12  
Old September 17th, 2010, 08:44 PM
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David Hazard
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Quote:
Originally Posted by Chris Vitale View Post
Bad diod in the alternator. I had the same problem. New alternator fixed the problem.
Good luck.
OK, thats 3 suggestions on the alternator. Im going to try unhooking it tomorrow (after the Buckeyes win of course) and seeing if thats the fix.
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  #13  
Old September 18th, 2010, 08:56 AM
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Will it rev past 2500 in neutral ?
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  #14  
Old September 18th, 2010, 01:12 PM
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Chris Davis
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Mine was the alternator. One of the zenier diodes had falled making the rectifier produce some A/C current which makes the coil misfire. For me it was at 2300 RPM, any gear.
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  #15  
Old September 18th, 2010, 01:29 PM
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David Hazard
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Quote:
Originally Posted by kenny kustom View Post
Will it rev past 2500 in neutral ?

Yes it will. No problem in neutral only under load
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  #16  
Old October 15th, 2010, 02:23 PM
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David Hazard
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Installed the new alternator and that fixed it!!!! Thanks for the advice everyone!
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  #17  
Old October 15th, 2010, 03:58 PM
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good to hear
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  #18  
Old October 15th, 2010, 04:57 PM
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