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#1 |
Mustang Maniac
Join Date: Sep 2000
Location: GA, U.S.A
Posts: 2,266
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![]() Hey, the GT is not doing bad, but the it's having a little problem.
1) When I first crank it after it's been sitting for overnight, it really wants to shut off if I allow it to. 2) After it has warmed up, it doesn't idle well. It'll idle high (~1100 rpm) for a few seconds, then idle low (~ 600) in a loppy kinda way (like a umh, umh umh, instead of a smooth ummmmmmh). 3) Also, if I'm driving down the road and come to a light it'll idle high like mentioned in 2), then low, then high... even when I'm driving and am slowing down for a stoplight, if I depress the clutch pedal, it idles high (above 1000) and then after I FINALLY come to a dead stop, it'll drop down, but hten go up then down , etc (as already mentioned) Just to start off with easy things that I know haven't been recently changed anyway, I put in a new fuel filter and spark plug wires (trying to start off with the easy stuff). Could I be losing vacuum somewhere? What is the hose that comes out from the inside of the cavern of the upper intake (directly above the lower intake)? There are 2 hoses. The smaller one on the left (if you are looking at the intake from the front of the car) seems to be old and almost corroded. From the intake, I think it goes to a plastic junction that then goes to that smog canister. It's not easy to get to that's why I haven't changed it yet. Any ideas guys??? I don't really care for a ruff idling car........
__________________
351W-powered 1979 Ford Mustang Ghia notchback '79 Video @ Idle Stock 5.8L under 4" cowl 'glass hood, C4 w/ Transgo shift kit, Holley 750 cfm, Edelbrock Performer RPM intake; Fluidyne Al radiator, Flexalite 175 electric fan, 1 5/8" MAC shorty headers, FRPP Al driveshaft; S&W 6-point cage; 2.5" Off road H-pipe, 2-chamber Flowmasters, 8.8" Rear w/ 3.55s; Weld wheels (15x6;15x8), Front: 225/60/15, Rear: 275/50/15 Nitto NT 555R Drag Radials; 14 x 4” K&N X-stream air filter. '92 GT (5-speed) Small In Car Video Stock 5.0L, 2-chamber Flowmasters, MAC CAI, Tri-Ax, Al pedals... "Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body |
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#2 |
Registered Member
Join Date: Aug 2001
Location: Citrus Heights, CA
Posts: 74
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![]() I have a '81 Toyota truck (it's my wheeler) and I had the same problem that you have. My problem was a vacuum line totally fell off of the carb. I can't remember exactly where it was connected to, and I am at work right now, but when I get home tonight I will try to figure out exactly where it was. I don't know if this will help you other than it is a good possibility that it is a vacuum leak (hopefully). Take a piece of vacuum hose and listen through it at different places on your motor to see if you can hear anything.
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#3 |
Registered Member
Join Date: Apr 2002
Location: Downers Grove, IL
Posts: 464
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![]() Sounds like a vacuum leak to me, also could be your TPS.
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1989 Black Mustang GT Hatchback, Underdrive Pulles, Electric Fan, Cold Air Intake, Headers, Offroad H-Pipe, Magnaflow catback, Steeda Tri-Ax, Fluidyne Aluminum Radiator, Timing at 14*, 3.73's Coming not so soon: 408w Ricer Hater's Club Member #59 |
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#4 |
Registered Member
Join Date: Aug 2002
Location: Rochester
Posts: 553
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![]() did you disconnect your battery at all recently. you could just have to reset your idle. hope that helps!
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#5 |
Registered Member
Join Date: May 2002
Location: Ottawa illinois
Posts: 41
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![]() I took carb cleaner and sprayed the intake and found a leak....my car does the same exactly thing. and it was the gasket between the upper and lower intake.
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#6 |
Mustang Maniac
Join Date: Sep 2000
Location: GA, U.S.A
Posts: 2,266
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![]() Thanks for your input (sorry took me so long to reply, my internet's been off and on this week).
Yes, this does seem like a vacuum problem. If it were the '79, it'd be easy to figure out, but you can never right off tell with these newer cars.... ![]() I have disconnected the battery recently, but this problems seems to be different than just a idle (to high or too low) problem. Thanks.
__________________
351W-powered 1979 Ford Mustang Ghia notchback '79 Video @ Idle Stock 5.8L under 4" cowl 'glass hood, C4 w/ Transgo shift kit, Holley 750 cfm, Edelbrock Performer RPM intake; Fluidyne Al radiator, Flexalite 175 electric fan, 1 5/8" MAC shorty headers, FRPP Al driveshaft; S&W 6-point cage; 2.5" Off road H-pipe, 2-chamber Flowmasters, 8.8" Rear w/ 3.55s; Weld wheels (15x6;15x8), Front: 225/60/15, Rear: 275/50/15 Nitto NT 555R Drag Radials; 14 x 4” K&N X-stream air filter. '92 GT (5-speed) Small In Car Video Stock 5.0L, 2-chamber Flowmasters, MAC CAI, Tri-Ax, Al pedals... "Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body |
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#7 |
Mustang Maniac
Join Date: Sep 2000
Location: GA, U.S.A
Posts: 2,266
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![]() Well, that emissions hose was the problem. I changed it out and another piece and the car runs perfectly now. It was worse than I thought it was... just about completely dry rotted. I love an easy fix.
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__________________
351W-powered 1979 Ford Mustang Ghia notchback '79 Video @ Idle Stock 5.8L under 4" cowl 'glass hood, C4 w/ Transgo shift kit, Holley 750 cfm, Edelbrock Performer RPM intake; Fluidyne Al radiator, Flexalite 175 electric fan, 1 5/8" MAC shorty headers, FRPP Al driveshaft; S&W 6-point cage; 2.5" Off road H-pipe, 2-chamber Flowmasters, 8.8" Rear w/ 3.55s; Weld wheels (15x6;15x8), Front: 225/60/15, Rear: 275/50/15 Nitto NT 555R Drag Radials; 14 x 4” K&N X-stream air filter. '92 GT (5-speed) Small In Car Video Stock 5.0L, 2-chamber Flowmasters, MAC CAI, Tri-Ax, Al pedals... "Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body |
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