initial startup problem, and now it falls flat on its face

fiveohpatrol · 08-08-2002, 06:59 PM

well for a few months now, I've had some problems trying to get it to stay running after initial startup, but after about 15-20seconds of keeping it running, it will idle fine. I'm sure alot of people have had the same problem. IAC maybe?

also, I'm not sure if it's related, but this morning as i was on the way to work, I gave it some gas in 2nd gear and tried to get up to speed, but as soon as i hit 3000RPM with about 1/4throttle, it fell flat on its face and was popping very loudly through the exhaust. I could bring the RPM's up slowly above 3000, but if i tried to acclerate even halfway quickly it would buck badly.

I'm thinking its a severe lean condition, but I can't say for sure. The fuel pressure is fine at idle, and it ran very good at the track the other night, so i'm stumped.
When i went to drive it at lunch it ran perfectly, which sucks because intermittent problems are harder to find.

fuel pressure inertia switch? fuel pump?

any help would be greatly appreciated

PKRWUD · 08-08-2002, 08:17 PM

Check for codes, inspect the plugs, then share.

Take care,
~Chris

84LX89GT · 08-09-2002, 01:24 AM

fiveohpatrol, i have that initial start up problem with my car as well. I cleaned out the IAC with carb cleaner (to get all the sludge out) and i replaced the sealing o-ring as well. didn't do anything, but it was worth a shot for a couple of dollars (cost of o-ring and gasket). I was wondering myself what the problem could be. My car doesn't have any codes in it and the plugs are a light brown/gray color. I'm not too worried because once it starts and idles for a minute it runs great, but it's annoying.

08-08-2002, 06:59 PM	#1
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	initial startup problem, and now it falls flat on its face well for a few months now, I've had some problems trying to get it to stay running after initial startup, but after about 15-20seconds of keeping it running, it will idle fine. I'm sure alot of people have had the same problem. IAC maybe? also, I'm not sure if it's related, but this morning as i was on the way to work, I gave it some gas in 2nd gear and tried to get up to speed, but as soon as i hit 3000RPM with about 1/4throttle, it fell flat on its face and was popping very loudly through the exhaust. I could bring the RPM's up slowly above 3000, but if i tried to acclerate even halfway quickly it would buck badly. I'm thinking its a severe lean condition, but I can't say for sure. The fuel pressure is fine at idle, and it ran very good at the track the other night, so i'm stumped. When i went to drive it at lunch it ran perfectly, which sucks because intermittent problems are harder to find. fuel pressure inertia switch? fuel pump? any help would be greatly appreciated __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

08-08-2002, 08:17 PM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Check for codes, inspect the plugs, then share. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

08-09-2002, 01:24 AM	#3
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	fiveohpatrol, i have that initial start up problem with my car as well. I cleaned out the IAC with carb cleaner (to get all the sludge out) and i replaced the sealing o-ring as well. didn't do anything, but it was worth a shot for a couple of dollars (cost of o-ring and gasket). I was wondering myself what the problem could be. My car doesn't have any codes in it and the plugs are a light brown/gray color. I'm not too worried because once it starts and idles for a minute it runs great, but it's annoying. __________________ 2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)