2nd Generation Specific 1986-1992 Discussion

Hesitation Question

Old 12-15-2004, 12:07 AM
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i have an 87 gxl and the car hesitates at around 3k and 5k rpm, ive tried a few things, grounding kit, ran more power to the alternator and starter, just did a compression test both rotory housings are 90psi, so the engines still good, i can hear an exhaust leak and im planning on replacing all the gaskets, any other suggestions what could be causing the hesitations?
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Old 12-15-2004, 11:34 AM
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what about the basics like checking the resistance of coils per FSM spec? condition of plugs? plug wires?
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Old 12-15-2004, 12:11 PM
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i did the full tune up on it, its running new ngk plugs and wires
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Old 12-15-2004, 12:15 PM
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You know...I grounded my injectors and replaced the fuel filter and changed the plugs and I'm STILL getting the stutter.



Are you backfiring? I was...big time. I started running premix (but haven't removed the OMP just yet) and it seemed to make a big difference. Granted, the hesitation is still there, but it's better. I think maybe we need to get our injectors cleaned and flowed. does anybody here know the best place to go for this?
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Old 12-15-2004, 08:34 PM
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does anybody here know the best place to go for this?


http://www.witchhunter.com/



Excellent service and the lowest price I've seen to date.
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Old 12-16-2004, 11:29 AM
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i would order a second set of used injectors and have those done, so that you are not with out a car. or just put new ones in.
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Old 12-16-2004, 11:38 AM
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Originally Posted by halfrice' date='Dec 14 2004, 10:07 PM
i have an 87 gxl and the car hesitates at around 3k and 5k rpm, ive tried a few things, grounding kit, ran more power to the alternator and starter, just did a compression test both rotory housings are 90psi, so the engines still good, i can hear an exhaust leak and im planning on replacing all the gaskets, any other suggestions what could be causing the hesitations?





Is it N/A or turboed?
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Old 12-16-2004, 01:22 PM
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NA, i also tried running an extra ground to my pressure sensor, i heard that it helps on turbo cars running that ground to the boost sensor, no luck with my car tho
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Old 12-20-2004, 11:23 PM
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sounds like your aux ports and your vdi arent being opened... its an 87 so its using backpressure from the exhaust. is your split air pipe hooked up?



usually 5/6 ports open around (i believe) 3800 and the vdi opens about 5252 rpms...



check for a clogged cat, the split air pipe, your aux port actuators...



quick edit... i dont know if the s4's have VDI, i dont think so...
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Old 12-21-2004, 12:51 AM
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Originally Posted by sleejay' date='Dec 20 2004, 09:23 PM
sounds like your aux ports and your vdi arent being opened... its an 87 so its using backpressure from the exhaust. is your split air pipe hooked up?



usually 5/6 ports open around (i believe) 3800 and the vdi opens about 5252 rpms...



check for a clogged cat, the split air pipe, your aux port actuators...



quick edit... i dont know if the s4's have VDI, i dont think so...



thanks, will try/check
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