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Old 08-13-2011, 09:55 AM   #1
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Infamous surging idle

Here we go again with another surging idle question. I have an 89 5.0 supercharged. It surges between 800 - 1200 rpm. I changed iac valve it got a little better (won't surge at every stop light). Today when I was messing around with it I opened what I believe is the evr. And plugged it with my finger and it stopped surging. Any opinions on what to do?
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Old 08-13-2011, 10:36 AM   #2
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Re: Infamous surging idle

from wut u described, the fuel pressure seems to be 2-5lbs low, but if u fixed it with wutever that thing is, go for it
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Old 08-13-2011, 10:58 AM   #3
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At idle I'm around 25-30 lbs. When I'm making boost it jumps to over 40 lbs. I didn't fix the problem wondering if I should replace it with a new one or could I eliminate it all together?
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Old 08-13-2011, 11:51 AM   #4
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Quote:
Originally Posted by Meansaleen
At idle I'm around 25-30 lbs. When I'm making boost it jumps to over 40 lbs. I didn't fix the problem wondering if I should replace it with a new one or could I eliminate it all together?
Fuel filter or sock on fuel pump could be half clogged
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Old 08-13-2011, 11:55 AM   #5
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I have an aeromotive a1000 external fuel pump with fuel filter. I highly doubt its my fuel pressure causing the surging idle. I have no vacuum leaks. Its just mind boggling
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Old 08-13-2011, 12:23 PM   #6
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Do you have a air/fuel monitor in your car
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Old 08-13-2011, 12:26 PM   #7
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Re: Infamous surging idle

Quote:
Originally Posted by Meansaleen View Post
At idle I'm around 25-30 lbs. When I'm making boost it jumps to over 40 lbs. I didn't fix the problem wondering if I should replace it with a new one or could I eliminate it all together?
Try disconnecting it and plugging off any vacuum lines going to it and see what happens.

I can't remember for 100% sure, but there was a cure for an ldle problem where you drill a .090" hole in the TB blade......anyone remember that and exactly what it was for?
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Old 08-13-2011, 12:28 PM   #8
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Re: Infamous surging idle

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I have an aeromotive a1000 external fuel pump with fuel filter. I highly doubt its my fuel pressure causing the surging idle. I have no vacuum leaks. Its just mind boggling
It's just them Ponies surging at the gate, trying to get out and run.......
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Old 08-13-2011, 09:17 PM   #9
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Re: Infamous surging idle

i just read your post>>> your running an fmu arent u?
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Old 08-13-2011, 09:35 PM   #10
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No fmu don't need it
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Old 08-13-2011, 09:42 PM   #11
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Re: Infamous surging idle

Well I guesse try getn rid of the evr and c wut happens...
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racing aod, 2700 stall, 3.42 gears, ported e7, 308ci, 1.7rr, comp .560valve springs, gear drive, high dwell module, msd 6a & coil, bbk off road xpipe, mac cat back, 30lbs inj, pro-m 90mm, welded subframe connectors, boxed upper & lower trailing arms, spherical axle bushings, 255/50/16 tires, 255lph pump, 456hp
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Old 08-21-2011, 08:12 AM   #12
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Quote:
Originally Posted by Meansaleen
Here we go again with another surging idle question. I have an 89 5.0 supercharged. It surges between 800 - 1200 rpm. I changed iac valve it got a little better (won't surge at every stop light). Today when I was messing around with it I opened what I believe is the evr. And plugged it with my finger and it stopped surging. Any opinions on what to do?
So I replaced the evr solenoid and it seems to have cured the surging idle quite a bit. I say 95%. Next I'm gonna check the salt and pepper shakers to make sure they have good contact. I'll keep ya posted for those with the same issue.
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Old 08-21-2011, 08:35 AM   #13
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Re: Infamous surging idle

was going to say I had the same probablem on my last project 88gt with a Paxton ,and I put a plate between the IAC AND intake ( forget what it was called ) but it had air adjusting screws in it and was thin ,but anyway it solved the problem .....
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