vacuum leak? Please help!! MONEY RACE FRIDAY!!!
#1
vacuum leak? Please help!! MONEY RACE FRIDAY!!!
Last week I noticed my car was idling a little high. The next sign i noticed was it shifting into overdrive once at a certain speed(which is normal) but after hitting a sustained highway speed it would shift back into 3rd. Lastly at the track my 60fts were normal, and car seemed to be running good, but it felt like it would shift to early, adn also was shifting into overdrive, or the converter was locking in the 1/8 mile. It is a Rossler 4L60E, and has been tuned by Dan @FLP. Never had this problem until last week. If you need more info to further help me please let me know. Thanks in advance.
P.S. I have a money race vs. a **** talking mustang owner this friday night, and need to it fixed before then.
P.S. I have a money race vs. a **** talking mustang owner this friday night, and need to it fixed before then.
#3
I checked all the vacuum lines i could without jacking the car up. Tomorrow Im going to tear into it more, but just wondered if anyone else could give me a little direction. Im supposed to race mike"5-O" friday, another mustang who is supercharger, and a jig 600 bike. So i need my **** running good, and not shifting into overdrive during the 1/8th.
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im not sure about the trans, to be honest. it doesnt make sense because there is no vacuum at WOT, and a vacuum leak wouldnt affect it. do you have a code reader/ scanner? also, i'd make a post in the trans section.
anything leak after the throttle body is a vacuum leak, and causes the car to idle higher. its like the throttle body being cracked slightly more, but the engine usually runs lean until the pcm corrects for it.
what happens when you spray the TB cleaner is the liquid gets sucked in, and adds fuel to the motor, and the motor bogs. you'll find it. just slowly move around the intake. spray the **** outta everything.
anything leak after the throttle body is a vacuum leak, and causes the car to idle higher. its like the throttle body being cracked slightly more, but the engine usually runs lean until the pcm corrects for it.
what happens when you spray the TB cleaner is the liquid gets sucked in, and adds fuel to the motor, and the motor bogs. you'll find it. just slowly move around the intake. spray the **** outta everything.
#7
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Actually, the rpm's will usually increase with that test. Carb cleaner, brake clean, Tb cleaner, will all do the same thing.
I doubt its actually shifting into OD because you have it in "drive" anyway, not OD. Maybe locking 3rd, which I also doubt would happen in the 1/8 mile, and if so wouldn't hurt it.
I doubt its actually shifting into OD because you have it in "drive" anyway, not OD. Maybe locking 3rd, which I also doubt would happen in the 1/8 mile, and if so wouldn't hurt it.
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#8
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im not sure about the trans, to be honest. it doesnt make sense because there is no vacuum at WOT, and a vacuum leak wouldnt affect it. do you have a code reader/ scanner? also, i'd make a post in the trans section.
anything leak after the throttle body is a vacuum leak, and causes the car to idle higher. its like the throttle body being cracked slightly more, but the engine usually runs lean until the pcm corrects for it.
what happens when you spray the TB cleaner is the liquid gets sucked in, and adds fuel to the motor, and the motor bogs. you'll find it. just slowly move around the intake. spray the **** outta everything.
anything leak after the throttle body is a vacuum leak, and causes the car to idle higher. its like the throttle body being cracked slightly more, but the engine usually runs lean until the pcm corrects for it.
what happens when you spray the TB cleaner is the liquid gets sucked in, and adds fuel to the motor, and the motor bogs. you'll find it. just slowly move around the intake. spray the **** outta everything.
Kyle, go by the house and get that scanmaster, it'll help.
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I think I have a vacumme leak too, started idleing high, and searching for idle after it warmed up. Sorry for the thread hi-jack, but ill try th tb cleaner.
Hope you dragged that mufstang up and down
Hope you dragged that mufstang up and down
#11
It just sucks because the car isnt running horrible, just weird. It did a 6.89 1/8th tonight in its shitty condition.....I just dont get it.
#14
I have a Vic Jr intake, so that isnt my problem. BUT i do know exactly what you are talking about. I rerouted all my lines to catch can, and I havent checked all the connections lately. I will look into that.
Im gonna see if the scanmaster is pulling any codes tommarow, if so look up and see what the computer reads is wrong.
#16
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Check on the passenger side of your TB, with mine it's blocked off with a piece of hose and a bolt in the end, it's a vacumn pipe, when ever mine backfires on start up through the manifold it tends to spit the bolt out causing the idle to increase to around 1200rpm, other than that car runs normal
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one quick test that'll confirm it being a vacuum leak is, if you have vacuum brakes still, with the car running press the pedal rapidly. if rpm fluctuates, a vacuum leak is your problem.