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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 03-30-2012, 08:52 AM   #1
bradyd15
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Quote:
Originally Posted by LuckyX2 View Post
Hi,

So my SR has been having a some idle issues for a while now but I'm just getting around to fixing them. I was hoping you guys could offer some tips.

Here are the issues:
-Idles at 1500-2000 both hot and cold. My throttle stop screw is removed btw, so my throttle plate is completely closed and I have the IACV screw screwed in all the way. I have checked for vacuum leaks and nothing...
-Sometimes the idle will climb from 1500 or so up to around 2000 and then drop suddenly back to 1500 and repeat.
-Backfiring/sputtering when I start it, idles and runs smoothly after that (however at a high idle as said)
-Throttle sticks at a stop (sticks closed) Could be because it closes completely with the stop screw removed and there is some "goop" in the body making it sticky?

I have a haltech platinum 1000 standalone (MAP not MAF btw) and I feel that many of these issues may be resolved just by changing settings there. Anyone here have some experience with getting a smooth start/idle out of a standalone on an SR? It runs great everywhere but idle and is embarrassing how it sputters and shakes upon start-up.

Any ideas?
TPS sensor, maf sensor, or timing could be off. Are you using e-fans? Alternator check? Or throttle plate sticking like di-devol suggest. Check all.
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Old 03-30-2012, 09:16 AM   #2
LuckyX2
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-TPS voltage is good, as confirmed by the Haltech.
-I'm MAP, not MAF.
-Base timing is good and then advanced a bit by the Haltech.
-Alternator should be good, my battery isn't dying or anything like that.
-I have electric fans, yes.
-I'll take a look at the throttle tonight.

Thanks.
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