TPS Help Please 1990 XJ 4.0L 242 cid (Long)
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Joined: Dec 2014
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From: Oregon (Wetside)
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0l
If you get another bad one check on Ebay for a OEM Mopar one. Jeep hasn't made these in years so new old stock on Ebay is the only place I know of to get one. Napa would be my only other choice for this part.
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Joined: Mar 2021
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From: CO
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L i6 242ci
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Newbie
Joined: Mar 2021
Posts: 12
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From: CO
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L i6 242ci
When moving the throttle with the bad sensor I'll be switching out later today the output value on the flat 3 prong when metering B to C would go from a max adjustmed 0.38v to a max deflection of 2.02v with the throttle all the way open. At one point I took the sensor off and moved it from min to max and the voltage would go from 0.01v to 2.14v before dropping to 0.00v if I pushed the arm all the way to the end of it's path.
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Joined: Mar 2021
Posts: 12
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From: CO
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L i6 242ci
So I finally replaced the TPS with a new one from NAPA. It is reading much better voltages (4.88v supply and after adjustment 0.82v output.) Grounds are nice and clean with less than an ohm of resistance showing with key off.
So yay! That's solved!
But it's still stuttering and backfiring if I rev the engine up to 2500-3000 rpm, which is discouraging. Its also running super super rich by the smell of it. I didn't take it out for a drive because if it's backfiring in neutral when revving in the past it was worse in drive.
Any direction or assistance would be a huge huge help. Thanks for your guy's help so far.
So yay! That's solved!
But it's still stuttering and backfiring if I rev the engine up to 2500-3000 rpm, which is discouraging. Its also running super super rich by the smell of it. I didn't take it out for a drive because if it's backfiring in neutral when revving in the past it was worse in drive.
Any direction or assistance would be a huge huge help. Thanks for your guy's help so far.
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Newbie
Joined: Mar 2021
Posts: 12
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From: CO
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L i6 242ci
After I swapped my t-body out, I accidentally knocked the MAP hose out of the sensor. Gave me fits trying to figure it out. Until I just happen to see a random hose hanging. It would idle~ish., bog real bad if you tried to rev it.
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