had ground problems, all fixed but engine has low power

Gunter · Apr 7, 2016

yeah there it is. i did install a new temp sensor in the block, and fixed all the ground issues per Cruiser54's instructions.
just now low power, and at startup high idle for 2 to 5 seconds .
it runs good, upshifts fine, downs shifts idles good. no leaks, no knocks, no smoke.
fuel pressure is with in specs.
i can barely maintain 55 mph.
when i had my ground problems, i had massive TPS problems.

thoughts or ideas where to start?

thanks in advance !! :rattle:

old_man · Apr 7, 2016

If you removed the tps, make sure you put it back with the activator arm on the right side of the throttle shaft bar.

Hypoid · Apr 7, 2016

Do a compression test?

Gunter · Apr 7, 2016

old_man said:
If you removed the tps, make sure you put it back with the activator arm on the right side of the throttle shaft bar.

yep i made sure of it. all set correctly

Gunter · Apr 7, 2016

Hypoid said:
Do a compression test?

not yet. it ran like crap ola for about a month and a half. before that, ran strong and lots of power. i thought a dead cylinder. semi dead cylinder.....but my mileage would have go to hell. mpg's are about same as always

Ecomike · Apr 12, 2016

Cat converter honeycomb may have broken and turned sideways blocking exhaust. Are you sure you have a good TPS now and properly calibrated?

Fuel pressure OK under load, or higher RPM?

Rear brakes locked?

Weak spark at higher loads?

Sounds like a partly blocked exhaust or active rear brakes (emergency break off?), or too little fuel at higher demand rates. You can run a fuel flow rate test with a hose and the engine off!!!!!!!!!!!!!!!!! Need to pull the shraeder valve first with a tire valve tool IIRC

Digger87xj · Apr 12, 2016

Green Mesa XJ · Apr 12, 2016

Seen clogged cats do this. Specifically someone had a s10 which couldn't do 55 on the interstate.

If it's your brakes you should be able to smell it. Ought to be red hot.

Had a rear caliper stuck on the commander got the laser temperature gauge out, hundreds of degrees hotter than the other sides.

Sent from my iPhone using Tapatalk

Ecomike · Apr 12, 2016

Digger87xj said:
cat

LOL, its going to rain, we both agree, so it must be the Cat!!!

LOL, I vaguely remember a credentials battle we had over who was right on a topic ages ago. I think you won the what was wrong battle.:laugh3:

Ecomike · Apr 12, 2016

Green Mesa XJ said:
Seen clogged cats do this. Specifically someone had a s10 which couldn't do 55 on the interstate.

If it's your brakes you should be able to smell it. Ought to be red hot.

Had a rear caliper stuck on the commander got the laser temperature gauge out, hundreds of degrees hotter than the other sides.

Sent from my iPhone using Tapatalk

I think 99% of all the ones I ran across, jeep or not, were clogged exhaust, or a bad TPS or stuck brakes. A bad transmission / clutch would show a high rpm from slippage.

Digger87xj · Apr 12, 2016

Ecomike said:
LOL, its going to rain, we both agree, so it must be the Cat!!!

LOL, I vaguely remember a credentials battle we had over who was right on a topic ages ago. I think you won the what was wrong battle.:laugh3:

hah yeah could be.... never know though, rare for anyone to post the fix.

Honestly, it's a crapshoot at best, diagnosing peoples car problems on the forums... they rarely describe the symptoms accurately.

Five different failures can cause the same symptom, and people tend to try and fix the symptom, not the failure.

Ecomike · Apr 12, 2016

Digger87xj said:
hah yeah could be.... never know though, rare for anyone to post the fix.

Honestly, it's a crapshoot at best, diagnosing peoples car problems on the forums... they rarely describe the symptoms accurately.

Five different failures can cause the same symptom, and people tend to try and fix the symptom, not the failure.

Sounds typical of the pharmacy and medical industry, MDs, it must be second nature for humans?

"and people tend to try and fix the symptom, not the failure"

OEM XJ jeeps are no exception. People need more Tech background LOL. Start maybe in gradeschool

had ground problems, all fixed but engine has low power

Gunter

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old_man

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Hypoid

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Gunter

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Digger87xj

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Green Mesa XJ

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