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94 GT Bucking/Bogging/Backfiring/Barely able to idle

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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

94 GT Bucking/Bogging/Backfiring/Barely able to idle

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Old 06-15-2013, 09:47 PM
  #1  
90Stang306
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Default 94 GT Bucking/Bogging/Backfiring/Barely able to idle

Hey I have a 94 GT and I was driving today and out of nowhere it started bucking backfiring and bogging down. I managed to get it home but the fastest the car was able to go was about 5mph. I did a tune up a month ago and its been fine...Today I changed the fuel filter, ignition coil, checked the MAF and changed the EGR. The car ran good for 3 minutes after changing the EGR but then went right back to bucking/bogging/backfiring/barely running. Any suggestions as to whats happening here? I'm thinking the pick up in the distributor but not 100% sure. Please help
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Old 06-16-2013, 06:00 AM
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dawson1112
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I have an idea , try to remove the vacuum line from the egr and plug it. If the egr vacuum control solenoid is bad it may have stuck open causing the egr to open . after that its usually the tfi or the pip in the dizzy that causes the bucking.

I would thing that with that much trouble you would have a trouble code stored in the computer. Does the check engine light come on at all?
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Old 06-16-2013, 08:18 AM
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90Stang306
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no trouble codes, no check engine light. I'm gonna be buying the distributor this morning so hopefully thats the issue. I still need to install the new iac so maybe I'll pick up a tfi and a new MAF at the same time and just replace it all lol
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Old 06-16-2013, 12:00 PM
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90Stang306
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ok I did what you said and it made a difference so I went out and bought the egr vacuum solenoid and now the car is at least running and I can drive it but its breaking up at about 2000rpms. Still doesnt have its full power but it goes for the most part. I might have to buy the TFI and MAF but im wondering if I fouled the spark plugs? What do you think?
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Old 06-16-2013, 02:54 PM
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dawson1112
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you may need to take the egr off and clean it out so that it closes all the way. To much egr and it will stumble and cut out , I don't even have the egr hooked up on mine its blocked off and plugged.

Also it may help to clear the ecm by disonecting the battery for about 30 min.
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Old 06-16-2013, 03:24 PM
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90Stang306
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The egr valve is brand new. I changed it yesterday. I picked up the TFI before but nobody around here had the dizzy or at least a pip so im gonna have to order those. I had a similiar problem on my 90 and it turned out the computer was bad. I'm hoping that isnt the case. Really dont want to buy a computer. Probably better off just buying a damn crate engine which was my original plan lol
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Old 06-16-2013, 03:27 PM
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Can you post a pic of how you have the egr blocked off?
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Old 06-17-2013, 04:11 PM
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j-town_edge
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I know you said yoiu did a tune up recently, but have you checked your plugs? I only ask because you didn't mention it. IIRC, a blown plug or misfire usually shows up as a CEL.
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Old 06-17-2013, 07:41 PM
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90Stang306
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I havent checked the plugs yet but I was thinking that I fouled them out from the car running like ****. Also I have no CEL coming on but I did buy a obd-1 scanner for fords so im gonna check if there are any codes stored. I also grabbed a tfi and a dizzy and I brought my fuel pressure guage home from work so im gonna go out and check all that **** now
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Old 06-17-2013, 08:23 PM
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90Stang306
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Sooooooo I'm retarded.....here we go.....Since saturday when this started I called my father and asked him to drive behind me while I bring my car to my house because it only goes 5mph. When he got there he asked me what I think is wrong and my first answer was, I think the fuel pump is shot. Today I decide to bring my fuel pressure guage home. I hooked it up and at idle I have 38psi. As soon as I push the button on the guage my psi drops to 0. Looks like im gonna go buy a fuel pump tomorrow. Hopefully that is the problem but im almost 100% right now
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