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Author
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Topic: surging idle
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jessdawg5.0
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Member # 12815
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posted
 
 
Does anyone know the most common reason for idle surging my car is an 88gt with new motor with edelbrock 6025 heads cobra upper and lower intake e303 cam if you need more info just let me know thank you in advance
Posts: 64 | From: el sobrante ca | Registered: Apr 2013
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NEIGHT
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Member # 8741
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posted
Vacuum leak, IAC, fucked up MAF, dirty MAF?
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-Savage Habits-
1992 Summer Edition
1986 Hatch- catfish killer
1964 Impala hard top
Posts: 18530 | From: EA$T $IDE REDWOOD CITY | Registered: Nov 2008
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NK2186
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Member # 12319
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posted
You need to do a base idle reset. See the link below:
http://sbftech.com/index.php/topic,1031.0.html
I had to play with mine a few times to get the proper settings. It took all of the surge away though i could still watch the rpm needle move ever so slightly however it stopped the surging BS and was very drivable.
I also had an e-cam (don't let people hate on you for it)
Also if you have the stock Tach do not trust the RPM readings from it. If you have a timing light that tells you RPM's i suggest using it to help.
Oh yea also check that your PCV valve grommet is fully seated. Also make sure the PCV is fully seated too. This can be a huge vacuum leak.
[ 2013-08-16, 12:29 PM: Message edited by: NK2186 ]
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90 LX 5.0 - Stolen/stripped
89 LX 5.0 - Stolen and missing as of 7-24-13. LIC# 4HIP151 :(
99 Cobra
00 Exploder
Posts: 400 | From: Haystack | Registered: Aug 2012
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92_5.0
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Member # 7624
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posted
I would suggest to start by checking for vacuum leaks and then clean the IAC valve, throttle body and MAF sensor (make sure to use throttlebody cleaner and not carb cleaner) if that doen't help, try replacing the IAC valve ($50 part I think). I've never tried the re-learn procedure, but maybe it works? Foxbody's are known for this issue especially after installing an E303 cam, and sometimes you just have to live with it. I have an E303 cam as well and have the same issue, but mine is intermittent. Good luck ![[patriot]](graemlins/patriot.gif)
Posts: 1629 | From: bay area | Registered: May 2007
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jessdawg5.0
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Member # 12815
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Thanks for the info guys ima try all of it this weekend if i do have to live with it do you think it will still pass smog?
Posts: 64 | From: el sobrante ca | Registered: Apr 2013
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92_5.0
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Member # 7624
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posted
When it surges, if you tap the gas to about 1500 rpms will go back down?
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Infineon/Sears point? same difference!
11.8 @ 115 mph @ Sac Raceway
411 rwhp 402 trq (old set up)
540 rwhp 517 rwtrq (new set up)
ET's to come
Posts: 1629 | From: bay area | Registered: May 2007
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NK2186
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Member # 12319
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posted
If you go no vac leaks and the TPS is within the voltage range then the problem is a dirty Mass air flow sensor, dirty IAC valve, and also check the salt and pepper connections (Big black and white connectors that join the fuel injection harness to the main harness. These are on the back of the intake.
If all of that checks out resetting the computer and setting the idle should take care of it.
the E303 cam has no overlap so it can be a bitch but i was able to work out the kinks on mine it just would be a little rough on the idle which is why you bring the idle up higher than a stock cam.
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90 LX 5.0 - Stolen/stripped
89 LX 5.0 - Stolen and missing as of 7-24-13. LIC# 4HIP151 :(
99 Cobra
00 Exploder
Posts: 400 | From: Haystack | Registered: Aug 2012
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nasty93
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Member # 8935
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posted
I have same set up as you and mine had that surge.my maf was jacked.also my computer doesn't like the fenderwell cold air filter.I put on a regular cone filter and a better maf and my idle surge went bye bye.
Posts: 464 | From: windsor ,ca | Registered: Feb 2009
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