stumbling

331stroker · 09-19-2007, 09:42 AM

I have a 90 331 stroker. It has been doing great but about a week ago you would be driving and it would start stumbling like it is running out of gas, and a little popping and backfiring.
So I replaced the fuel filter-no change the I replaced the fuel pump-no change then I replaced the ignition modual-no change I am running out of options. I have 40lb of fuel pressure with the vacume line off the regulator at idle. This is a inerment problem it does not always run like this,but here is whats weird you can cycle the key off and back on quick asnd the stumbling goes away

Dark_5.0 · 09-19-2007, 10:33 AM

Check all of your grounds especially the ECU ground by the battery. I would also change the ignition switch.

USMC302 · 09-19-2007, 12:46 PM

You should try pulling codes.

ArtMan · 09-19-2007, 02:03 PM

The stumbling you describe could be dozens of things.

One other item to check is the black and white fuel injector harness connectors located behind the upper intake (aka. the salt and pepper shakers). With the engine idling try wiggling them and see if you get a reaction out of the engine.

Another cause could be the return signal of one of the sensors. Try the easier stuff first.

331stroker · 11-02-2007, 12:05 AM

I got it figured out I changed the fuel pump relay and the fuel filter.
Runs better

09-19-2007, 09:42 AM	#1 (permalink)
331stroker Registered Member Join Date: May 2007 Posts: 9	stumbling I have a 90 331 stroker. It has been doing great but about a week ago you would be driving and it would start stumbling like it is running out of gas, and a little popping and backfiring. So I replaced the fuel filter-no change the I replaced the fuel pump-no change then I replaced the ignition modual-no change I am running out of options. I have 40lb of fuel pressure with the vacume line off the regulator at idle. This is a inerment problem it does not always run like this,but here is whats weird you can cycle the key off and back on quick asnd the stumbling goes away

09-19-2007, 10:33 AM	#2 (permalink)
Dark_5.0 Moderator Join Date: Apr 2001 Location: Staging lane Posts: 4,330	Re: stumbling Check all of your grounds especially the ECU ground by the battery. I would also change the ignition switch. __________________ 92' LX-Big brakes, Lots and lots of suspension, Vortech A-trim 7 psi 331 stroker, Canfield heads, Edelbrock Performer RPM II intake, Big comp cam looking for a home.

09-19-2007, 12:46 PM	#3 (permalink)
USMC302 Registered Member Join Date: Apr 2001 Location: San Diego, Ca Posts: 1,265	Re: stumbling You should try pulling codes. __________________

09-19-2007, 02:03 PM	#4 (permalink)
ArtMan Registered Member Join Date: Dec 1998 Location: Scarsdale, NY Posts: 45	Re: stumbling The stumbling you describe could be dozens of things. One other item to check is the black and white fuel injector harness connectors located behind the upper intake (aka. the salt and pepper shakers). With the engine idling try wiggling them and see if you get a reaction out of the engine. Another cause could be the return signal of one of the sensors. Try the easier stuff first. __________________ See my stang in the "Users Rides" section. Rice Hater's Club Member #225

11-02-2007, 12:05 AM	#5 (permalink)
331stroker Registered Member Join Date: May 2007 Posts: 9	Re: stumbling I got it figured out I changed the fuel pump relay and the fuel filter. Runs better

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