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Unread 02-06-2013, 01:59 PM   #1
massarosareloud
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1996 ZJ 
 
Join Date: Dec 2012
Posts: 218
TPS Voltage too low?

Since I've had my Jeep, I'll start it and once I take it down my driveway, it'll sputter and almost stall for a 1/2 mile or so. Once I give it some serious gas it'll all the sudden start to respond.

When it's idling in park or in drive with my foot on the brake the idle rpm's bounce around (+/- 150-200rpms from about 600 rpm) constantly, and when it has large drops it'll go to about 100-200 rpm's then jump back up. Once the problem goes away in the first few mins of driving it doesn't normally come back in that trip.

So I checked the TPS voltage and it starts at .8 volts with fully closed throttle, then at WOT it reads 3.84 volts. Seems a little low to me, but the voltage rose and fell smoothly. Anyone this think this could be causing my problems? I've already cleaned my IAC.

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1996 Jeep Grand Cherokee Limited Edition 4.0L
3.55 axles, stock pretty much everything, except for a PSC steering gear and fuel injectors
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Unread 02-06-2013, 03:20 PM   #2
ratmonkey
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1997 ZJ 
 
Join Date: Dec 2006
Location: , Pennsylvania
Posts: 19,794
the idle voltage is a touch high, but still within normal range. the wot is a bit low, but still within suggested ranges.

idle should be between about .5-.7v and wot should be less than 4.5. hardly ever see any above 4.2-4.3 though.

any codes?
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'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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Unread 02-06-2013, 04:02 PM   #3
massarosareloud
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1996 ZJ 
 
Join Date: Dec 2012
Posts: 218
No codes, just trying to isolate the cause of this problem. I forgot to unhook the battery during the clean of the IAC so I unhooked it now and I'll see how it performs over the next couple days. The IAC was not very dirty though, barely any carbon buildup at all.
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1996 Jeep Grand Cherokee Limited Edition 4.0L
3.55 axles, stock pretty much everything, except for a PSC steering gear and fuel injectors
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