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Author
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Topic: Surging on startup
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MikeD.
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Member # 8060
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posted
 
 
Well, for the life of me I cannot figure out how to get rid of my surging problems on start up. Whether cold or warm I fire up my fox and it hunts around, jumping from 1200-500 and sometimes dies. After a minutes it idles fine at around 750/800. I have cleaned out the AIC valve, replaced and reset the TPS, checked for vacuum leaks with a whole can of starting fluid and a a propane torch (not lit of course). I checked the pcv system and everything is ran the right way. This all started after the Holley intake swap, but not right away. It was a few months after an all of the sudden it just started doing it. The car runs great, when I drive it and come to a stop the idle goes right to where it should be, it doesn't hang around. Any other ideas guys? I even ran an extra ground from the firewall ground right to the Neg battery cable, which actually cleared up a few other hiccups I had. Any other ideas?
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1999 FRC Vette
12.77 @ 110
Posts: 2854 | From: Vacaville Ca, 707 | Registered: Nov 2007
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Blind
2.3L
CAFords OG
Member # 3052
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posted
did you do a base idle reset procedure to it?
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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MikeD.
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Member # 8060
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posted
quote:
Originally posted by Blind:
did you do a base idle reset procedure to it?
Somewhat. I mean, I did it, but i dont know if I did it properly. Basically just let the car warm up, pull the aic plug, lower the idle as low as possible then turn off the car. Reinstall the the plug and start it back up. It was a cool for a little bit then went back to normal. Idk maybe my maf is going funky.
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1999 FRC Vette
12.77 @ 110
Posts: 2854 | From: Vacaville Ca, 707 | Registered: Nov 2007
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alexdel209
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Member # 9239
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posted
exactly sounds like a maf problem i had a similar problem in my 01 cobra.actually i have a 01 cobra maf laying around too idk if you could make that work for you .but try to clean the maf and see if that works
Posts: 1087 | From: 209, ca | Registered: Jun 2009
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Duncan Motors
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Member # 7045
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posted
you set the base idle, not as low as it goes, but at where u want it to idle.and u might try a coolant temp sensor for the ecu
Posts: 6310 | From: Vallejo | Registered: Sep 2006
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by Duncan Motors:
you set the base idle, not as low as it goes, but at where u want it to idle.and u might try a coolant temp sensor for the ecu
+1 on the ECT sensor, if it's not a vacuum leak, then problems that happen when the ecu switches out of warm up mode are usually related to the temp, either the thermostat is too cold, or the ECT is bad.
I don't think a MAF would cause these symptoms on a 5.0.
edit, and since I don't know it by heart, I always follow this guide to get a 5.0 idling right - http://www.muscularmustangs.com/iac.php
but even after all that, my `89 would surge like crazy at seemingly random times, until I bought the Ford Racing idle adjuster spacer for the IAC motor, it has 2 set screws on it that allow you to fine tune the airflow for idle, totally and completely cured the surge on my car, though it's stupid over priced for what it is, I think I paid $30 or $40 for it.
[ April 18, 2010, 09:45 PM: Message edited by: Blind ]
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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turbo50
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Member # 6700
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posted
where is ur timing at?
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.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
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MikeD.
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Member # 8060
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posted
It's at 16 now. I played with it between 13-16 and nothing changed. I just set it to 16, it doesn't ping and pulls good. I'm definately going to clean the salt n pepper connectors today. I actually noticed in the morning when I first fire it up, it doesn't surge really, but still a little bit.
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1999 FRC Vette
12.77 @ 110
Posts: 2854 | From: Vacaville Ca, 707 | Registered: Nov 2007
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