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Old 06-24-2014, 10:07 PM   #1
MikeyinaYJ's Avatar
Join Date: May 2014
Location: central coast california
Posts: 194
TPS Symptoms?

I have been chasing an intermittent starting issue. After extensive research and troubleshooting, I (may) have fixed the issue. The TPS. Its hard to say right now but I seen a good sign. 4 out of 4 starts were successful . So far. Anyway I can feel a difference in not only the idle, but the way it shifts. It used to shake badly if I didnt give it the right amount of gas while letting out the clutch from a stop. The transition from gear to gear just feels different. Also throttle response and rpm drop is definitely smoother. I had some weird scattered symptoms from hard starts to the exhaust sounding louder at idle and it not revving up til I shut it off and restart then it'd be normal. Its hard to explain the exhaust sounding louder idk the tone was just different. Anyone experienced this?

1994 jeep wrangler 2.5l
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Old 06-24-2014, 10:35 PM   #2
Join Date: Jun 2014
Location: Waldron Arkansas
Posts: 31
I've found that a bad TPS will cause some bucking issues at certain throttle positions and will not usually set a code until it is pretty bad.

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Old 06-24-2014, 11:29 PM   #3
MikeyinaYJ's Avatar
Join Date: May 2014
Location: central coast california
Posts: 194
Well start number 5 sadly was unsuccessful. Only this time I didnt have to touch the throttle just cranked for a long time before it fired up. Every now and then on those long cranks my starter will like clunk to a stop. I then have to let off the ignition and retry. Then some more cranking and it fires up .
1994 jeep wrangler 2.5l
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Old 06-25-2014, 04:17 PM   #4
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Location: Ridgway, Pa.
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If it's an extended cranking time the solenoid will get hot and kick out the bendix in the middle of the spin resulting in the loud clunk that you hear.

I would get a fuel pressure test, sounds like your pump might be failing. Can you hear the pump cycle before you turn the key to start? It should only run for 1.5 seconds or less if it hasn't lost any of its prime. Longer than that is signs of either a leak on the pressure line, or a failing fuel pump.
'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...
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