3800 Hesitation From Hell - NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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3800 Hesitation From Hell

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Old 03-29-2004, 08:45 PM
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Ok guys I did the search, I looked through all the suggestions, the TPS is set to 1 volt, and the car is acting weird as hell. 1988 N/A GXL



We removed the stock cats, has a newly installed header, and a gutted cat, the intake is the cone filter with adaptor from ebay, all installed at the same time. I broke the wiring for the O2 sensor, and am not sure exactly where it is under the UIM, so I have not hooked it back up.



But here is what it does, the car revs beautifully to 3600-3800 rpm, then will just act like it hit a brick wall or a fuel cut, if you back out of the throttle the car will rev faster but still is extremely sluggish. Also the car is hunting the idle, 1200-1500 rpm now.



the ground on the back of the block is good, and all the other connections are good as far as we can tell. all this happened after the install of all the parts above



Suggestions are welcome. I will try to tackle the O2 this weekend
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Old 03-29-2004, 08:50 PM
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Secondary injector wire pin broke? Stuck injector/s? yea that idle **** is ANNOYING! Its a vacuum leak probably.
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Old 03-29-2004, 09:30 PM
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I would start out by hooking the o2 sensor back up
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Old 03-29-2004, 09:36 PM
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Originally Posted by Rob x-7' date='Mar 29 2004, 09:30 PM
I would start out by hooking the o2 sensor back up
Yes I now believe thats what it is. It is also broke on my buds 7 and he has the same symptoms...
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Old 03-30-2004, 04:33 AM
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Originally Posted by 1Revvin7' date='Mar 29 2004, 06:36 PM
Yes I now believe thats what it is. It is also broke on my buds 7 and he has the same symptoms...
Why? The ecu only uses the o2 sensor under light throttle conditions to begin with.
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Old 03-30-2004, 05:16 AM
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The o2 sensor does crap, is only there for visual and o2 loop.



Check and see if your secondaries injectors by hook up a light or voltimeter to the injector plug and rev the cat to 4k to 4.5k and see if you see voltage.



I would also check to make sure the AFM plug is fully plugged in and no vacumm leaks after it.



If you have a tps tester, the one with the 2 light you can check your engine code and see if a sensor is faulty or disconnected.



C
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