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Author Topic: Head Scratcher  (Read 4813 times)

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Offline yellowjeep101

  • Budget Lift
  • Posts: 222
Head Scratcher
« on: May 21, 2012, 07:26:18 PM »
Alright, so I bought a stroker, installed it. Now some problems came up, I'm experincing hesitation followed by backfiring then a surge in power. I ordered a new tps sensor, but if that doesn't work, I'm stumped.
Check engine light is always on no codes. My jeep is a 2000 tj, so it has the coil pack, everything drivetrain is stock minus the stroker engine. Everything ran great before the swap.
So far I've tried a new cps, resetting the system, checking o2 sensors. Hmmmm. Any ideas?
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Offline cLAY

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Re: Head Scratcher
« Reply #1 on: May 21, 2012, 07:49:36 PM »
Backfiring thru the exhaust or intake?

Did the previous owner run a stock ECM programming or custom?
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'93 ZJ, 5.2L, lifted/locked/36s..<gone>
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Offline Uboatcmdr

  • Budget Lift
  • Posts: 186
Re: Head Scratcher
« Reply #2 on: May 21, 2012, 09:51:45 PM »
I've had the same issue numerous times before when the TPS gets wet.

Try it with the new TPS, and if that solves it go to pick and pull and grab a few spares.
Its not fun when your out wheeling and have no power to make it up hills.
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Offline yellowjeep101

  • Budget Lift
  • Posts: 222
Re: Head Scratcher
« Reply #3 on: May 21, 2012, 10:41:20 PM »
Idont know as of yet, I will hopefully find out about the ecm this week. And I sure hope the tps works, it runs fine sometimes then others it really ducks to drive.
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Offline yellowjeep101

  • Budget Lift
  • Posts: 222
Re: Head Scratcher
« Reply #4 on: May 22, 2012, 06:27:21 PM »
So the tps was partly to blame, it idles better. But its still having issues with hesitation followed by backfiring, then power again. Time for more research
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Offline BUKI

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Re: Head Scratcher
« Reply #5 on: May 22, 2012, 06:46:57 PM »
Kinda random, did you check for a vacume leak.
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Offline yellowjeep101

  • Budget Lift
  • Posts: 222
Re: Head Scratcher
« Reply #6 on: May 22, 2012, 07:07:24 PM »
Checked all over, no vacuum leak.
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Offline frenchy

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Re: Head Scratcher
« Reply #7 on: May 22, 2012, 08:24:00 PM »
I'll go out on a whim and say bad camshaft.
Pull valve cover and crank it over to see if the rockers all move same amount.
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Offline Bnine

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Re: Head Scratcher
« Reply #8 on: May 22, 2012, 08:32:56 PM »
Something is wrong with the timing, or feul delivery.

If its intermittent. You may want to check the injectors for a bad one. Does it straighten out when you get into it?
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Offline yellowjeep101

  • Budget Lift
  • Posts: 222
Re: Head Scratcher
« Reply #9 on: May 22, 2012, 09:48:00 PM »
Yes, when I go full throttle, it works great, and smooths out. The problem is intermittent.
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Offline cLAY

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Re: Head Scratcher
« Reply #10 on: May 23, 2012, 08:20:10 AM »
Did new O2 sensors go in with the new motor? Have you access to a scope that can monitor them while you drive? Any exhaust leaks?
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'93 ZJ, 5.2L, lifted/locked/36s..<gone>
'98 5.9er 4.10s,locked,LA,WJ knuckles

Offline yellowjeep101

  • Budget Lift
  • Posts: 222
Re: Head Scratcher
« Reply #11 on: May 23, 2012, 09:23:51 AM »
Same o2 sensors, could they cause the issues I'm having? If so, I'm off to the parts store.
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Offline cLAY

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Re: Head Scratcher
« Reply #12 on: May 23, 2012, 09:30:13 AM »
Could be but without being able to scan them you'd just be throwing parts at the problem.

I'm guessing they are the only sensors that didn't come with the motor?
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..

'93 ZJ, 5.2L, lifted/locked/36s..<gone>
'98 5.9er 4.10s,locked,LA,WJ knuckles

Offline yellowjeep101

  • Budget Lift
  • Posts: 222
Re: Head Scratcher
« Reply #13 on: May 23, 2012, 10:08:42 AM »
The engine came as a block, so my stock intake, exhaust, it came with the thermostat housing with the sensor in that, oh and the cps. Maybe ill take it in and get it scanned to avoid throwing money at it.
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Offline THE GOLD DIIGGER

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Re: Head Scratcher
« Reply #14 on: May 24, 2012, 10:47:24 PM »
Take it to Jay he said he no's what it is and can fix it for you so your not throwing money at it .
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