iBrent
Veteran CEG'er
Yes, once the secondaries kick in everything is fine...oh so fine.
also, its really really bad in 3rd gear, bad in 4th gear, bad in 5th gear, but not really noticable in 1st and 2nd.
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hesitation/bucking is back
- Thread starter getsum111
- Start date
Yes, once the secondaries kick in everything is fine...oh so fine.
also, its really really bad in 3rd gear, bad in 4th gear, bad in 5th gear, but not really noticable in 1st and 2nd.
JTod
CEG'er
Mine is doing the same thing. 98 CSVT with 115k miles. Thought a new EGR valve had the problem solved but it came back. My seems to be more pronounced when the car is cold. Guess I will look at the IMRC wiring as suggested by Green SVT.
getsum111
Yes I am a Pirate, 200 years too late.
This might be it!!!
This might be it!!!
OK guys, bear with me. Last night, my uncle and I hooked up a quage to test the fuel pressure, thinking the fuel pump could be the issue. At idle, I was reading 41 psi, and at throttle, around 54. This leads me to think that, as I have a return system, the RETURN LINE could be clogged. Now all the symptoms seems to fit this, or the fuel pressure regulator. Low mpg, due to too much fuel being sent to injectors, runs fine when secondaries open, due to increased air --> increased fuel needed. Gonna blow out the line tonight w/ my copmpressor, then if that's not it, check the FPR. Any tips on how to disconnect the fuel lines at the tank, and where to disconnect the line at the engine would be appreciated. Also, which one at the tank is the RETURN line.
As a side note, if this is it, and it cost nothing to fix, I'm gonna get sooooooooooooooooo drunk tonight.:laugh:
This might be it!!!
OK guys, bear with me. Last night, my uncle and I hooked up a quage to test the fuel pressure, thinking the fuel pump could be the issue. At idle, I was reading 41 psi, and at throttle, around 54. This leads me to think that, as I have a return system, the RETURN LINE could be clogged. Now all the symptoms seems to fit this, or the fuel pressure regulator. Low mpg, due to too much fuel being sent to injectors, runs fine when secondaries open, due to increased air --> increased fuel needed. Gonna blow out the line tonight w/ my copmpressor, then if that's not it, check the FPR. Any tips on how to disconnect the fuel lines at the tank, and where to disconnect the line at the engine would be appreciated. Also, which one at the tank is the RETURN line.
As a side note, if this is it, and it cost nothing to fix, I'm gonna get sooooooooooooooooo drunk tonight.:laugh:
Does the 99 have a Return line and FPR? I thought the changeover was in 1998. Returnless and Fuel sensor in the tank.
most 99s have a return fuel system, i know mine does but then again its an early 99 ... I believe only really late 99s might have returnless fuel systems other wise it is the 2ks only
todras
Pretty fly for a white guy *cowbell*
Ealy 99's have return I think.
iBrent
Veteran CEG'er
I have noticed a serious decrease in MPG in the last 8 months as well. Was getting close to 30, now I can barely get 23.
What happens (to other systems) at WOT? I read some cars at WOT turn off the AC compressor and all emissions systems in order to direct all power to the wheels. If this is the case, could the fact that its fine at WOT mean it has something to do with the emissions systems or am I way off?
If cleaning the return fuel line fixes it, let us know, so we can all get drunk tonight!
99 svt
CEG'er
On some cars, again I am not that familiar with contours, when the car goes to WOT,the pcm goes to pre-set air/fuel ratios instead of reading off the o2 sensors. This could mean a bad o2 sensor or MAF, but those usually throw codes. I'd check the normal things first, pulgs and wires, fuel filter, exhaust or vaccum leaks, just to rule them out first.
getsum111
Yes I am a Pirate, 200 years too late.
I've checked everything. All sensors, multiple sets of wires, etc. This is the last thing.
BTW, the switch to returnless was aroung 5/3/99. Most pumps ask if the car was made before or after that date.
BTW, the switch to returnless was aroung 5/3/99. Most pumps ask if the car was made before or after that date.
getsum111
Yes I am a Pirate, 200 years too late.
Still can't find which line is which on the top of the fuel tank.
99 svt
CEG'er
I'm lookin on AllData tryin to fix my car. This is what it says about the fuel lines.
Fuel supply line connectors are white or are identified by a white band. Fuel return line connectors are red or are identified by a red band.
Fuel supply line connectors are white or are identified by a white band. Fuel return line connectors are red or are identified by a red band.
getsum111
Yes I am a Pirate, 200 years too late.
Nice. Thanks, BTW, where is Edwardsville? I'm outside Pittsburgh, as are a few others. Thanks for the info.
99 svt
CEG'er
Wilkes-Barre Scranton area. My mom lives in Altoona, not to far from Pitt.
Yeah, if you search AllData, you can sign up for a subscription. It contains most everything on repairing a vehicle. Diagrams, how-to repairs, tech service bulletins, and even how long a job normally takes. It costs 25 bucks for a year, or 45 for 3 years for one specific vehicle, and 15 bucks for each additional for a tear, not sure on additionals for 3 years. Maybe a bunch of CEGers could split the cost and share a login, but I don't know if that is legal or not....
Yeah, if you search AllData, you can sign up for a subscription. It contains most everything on repairing a vehicle. Diagrams, how-to repairs, tech service bulletins, and even how long a job normally takes. It costs 25 bucks for a year, or 45 for 3 years for one specific vehicle, and 15 bucks for each additional for a tear, not sure on additionals for 3 years. Maybe a bunch of CEGers could split the cost and share a login, but I don't know if that is legal or not....
getsum111
Yes I am a Pirate, 200 years too late.
Blew out return fuel line, still bucking. Gonna try a new fuel pressure regulator.:shrug:
MCconnection cc
CEG'er
I second that...
getsum111
Yes I am a Pirate, 200 years too late.
Crap!
Crap!
OK, I'm outta ideas. I put on a new fuel pressure regulator, since that is what the Haynes manual said to do if the fuel pressure was high and the return line wasn't blocked. No difference. Stupid Haynes manual.
Crap!
OK, I'm outta ideas. I put on a new fuel pressure regulator, since that is what the Haynes manual said to do if the fuel pressure was high and the return line wasn't blocked. No difference. Stupid Haynes manual.
have you checked the line to the FPR for leaks ?
getsum111
Yes I am a Pirate, 200 years too late.
The vac. line, yes. I plugged the other end and blew into it (no smart comments, please :laugh: ), it was good. No leaks. Or did you mean the fuel line itself. I didn't check that, but I would assume I would smell gas leaking.
my77stang
New CEG'er
Hey everyone. first i'll take a quick second to say Hola, as this is my first post.
I have a 96 with a 2.0 and it sounds like mine is doing the same thing or pretty close to it. it starts and idles perfectly, but when you try to rev it at all it hesitates for almost a solid second and then starts to rev. also i noticed while driving down the road it will pick up speed ok unless i give it too much throttle and then its like its bogging it down.
the wife said the car was hesitating before, and since then we only drove it once in 7 months cause we upgraded to a 2006 Mustang GT :laugh:.
anyways after charging up the battery, putting 5 gallons of premium and driving it for about 35 miles, its still doing the same thing. i tried some seafoam fuel system cleaner as recommended by the lovely people at mustangforums.com (who referred me here), checked for vacuum leaks, inspected the air cleaner, and still its the same.
now this car was having similar symptoms a long time ago but a MAF sensor fixed it (it WAS throwing code "fuel system lean" according to autozone) but when that was the problem it didnt fall on its face at more than half throttle.
the car has 209,000 miles on it but i scored a zero miles ford crate motor from ebay 60k miles ago. i replaced the o2 sensors, fuel filter, and anything else i could think of when i did the motor swap so my sensors arent that old.
someone PLEASE help i need to sell this thing and idont wanna dump money into it guessing at the cause.
I have a 96 with a 2.0 and it sounds like mine is doing the same thing or pretty close to it. it starts and idles perfectly, but when you try to rev it at all it hesitates for almost a solid second and then starts to rev. also i noticed while driving down the road it will pick up speed ok unless i give it too much throttle and then its like its bogging it down.
the wife said the car was hesitating before, and since then we only drove it once in 7 months cause we upgraded to a 2006 Mustang GT :laugh:.
anyways after charging up the battery, putting 5 gallons of premium and driving it for about 35 miles, its still doing the same thing. i tried some seafoam fuel system cleaner as recommended by the lovely people at mustangforums.com (who referred me here), checked for vacuum leaks, inspected the air cleaner, and still its the same.
now this car was having similar symptoms a long time ago but a MAF sensor fixed it (it WAS throwing code "fuel system lean" according to autozone) but when that was the problem it didnt fall on its face at more than half throttle.
the car has 209,000 miles on it but i scored a zero miles ford crate motor from ebay 60k miles ago. i replaced the o2 sensors, fuel filter, and anything else i could think of when i did the motor swap so my sensors arent that old.
someone PLEASE help i need to sell this thing and idont wanna dump money into it guessing at the cause.
Bienvenido
. Scan for CEL codes (free service at Advance or Autozone) and post. When was the last time the fuel filter was changed?