Idle Problem

billb303 · May 21st, 2008, 11:48 PM

I just installed some 30# injectors with a Pro M 77 mass air calibrated for the injectors. My car is hunting for an idle between 800 and 1300 rpm. The check engine light comes on intermittently also. My fuel pressure is good and the car is very responsive when I give it gas. I have checked all my vacuum lines and electrical connections and everything is in place. I disconnected the battery for about 15 minutes also. Anyone have any ideas what may be causing this?

billb303 · May 22nd, 2008, 10:46 AM

Anyone?

dr.gonzo! · May 22nd, 2008, 11:49 AM

what do you have done on your engine?

shadowgames81 · May 22nd, 2008, 11:50 AM

Could it possibly be the IAC? I know I had to get one of the adjustment plates that goes in between the iac and throttle body to adjust it. Car would run great but die at stop lights.

billb303 · May 22nd, 2008, 12:15 PM

The engine is stock. I don't think it is the IAC since I did not have the problem before the injector/mass air install.

dr.gonzo! · May 22nd, 2008, 12:36 PM

you went from 19# injectors to 30# with out any mods? I think your running way rich

ryans88gt · May 22nd, 2008, 01:21 PM

Try dropping the fuel pressure about 10 PSI, and make sure you have the vacuum hose going to the fuel regulator.

1slo5.0 · May 22nd, 2008, 05:00 PM

Originally Posted by shadowgames81

Could it possibly be the IAC? I know I had to get one of the adjustment plates that goes in between the iac and throttle body to adjust it. Car would run great but die at stop lights.

Those plates are band aids to hide a problem. Fix the problem and you won't need the band aid.

1slo5.0 · May 22nd, 2008, 05:03 PM

Originally Posted by billb303

The engine is stock. I don't think it is the IAC since I did not have the problem before the injector/mass air install.

There is your problem. Take the 30lb injectors out and put the stock ones back in. Those 30lb injectors are only going to hurt you in a stock engine. I bet if you dynoed it the engine is making less power now than it was before you swapped injectors. More fuel doesn't add more horsepower unless you have the ability to burn that fuel efficiently. In your case the extra fuel you are getting is dumping right out of the exhaust.

May 21st, 2008, 11:48 PM	#1
billb303 Newbie Join Date: Oct 2006 Posts: 27 iTrader: 0 reviews	Idle Problem I just installed some 30# injectors with a Pro M 77 mass air calibrated for the injectors. My car is hunting for an idle between 800 and 1300 rpm. The check engine light comes on intermittently also. My fuel pressure is good and the car is very responsive when I give it gas. I have checked all my vacuum lines and electrical connections and everything is in place. I disconnected the battery for about 15 minutes also. Anyone have any ideas what may be causing this?

May 22nd, 2008, 01:21 PM	#7
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	Try dropping the fuel pressure about 10 PSI, and make sure you have the vacuum hose going to the fuel regulator. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

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May 22nd, 2008, 10:46 AM	#2
billb303 Newbie Join Date: Oct 2006 Posts: 27 iTrader: 0 reviews	Anyone?

May 22nd, 2008, 11:50 AM	#4
shadowgames81 Hardcore Enthusiast 87 Coupe Join Date: Sep 2006 Location: Hampton, VA Posts: 1,220 iTrader: 3 reviews	Could it possibly be the IAC? I know I had to get one of the adjustment plates that goes in between the iac and throttle body to adjust it. Car would run great but die at stop lights.

May 22nd, 2008, 12:15 PM	#5
billb303 Newbie Join Date: Oct 2006 Posts: 27 iTrader: 0 reviews	The engine is stock. I don't think it is the IAC since I did not have the problem before the injector/mass air install.

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