Idle Problems
#1
Nothin But a G Thang
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Idle Problems
k, my idle isnt being very nice, when its cold it actually idle's where its supposed to ~750 but when its warm it sometimes stays at ~ 1400rpms but if i leave it in gear and bring it down to the right idle rpms it stays there. however after a few seconds it starts to bounce up and down...ive adjusted the tps but i still have no clue why its doing this, the car pulls nice and hard when im driving but it sucks sitting in traffic and having your engine rev up and down. i did the tb mod rencently so thats prolly the cause of some problems, i have that coolant hose that went to the back of the tb rerouted to the bac. but i should be able to get it all correct...or i hope i can. thanks
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i set up the tps with the led lights taht mazda uses to do it...mazda techs left one on my car once. yes the car was fully warmed up. i suppose it could be a vac leak, were/are any hoses that connect to the tb vac lines?
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#9
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Ok, if the idle just kind of slowly goes lower till the car dies. Then it's something like a fuel filter or injectors plugged. But if the motor is bouncing up and down. Then its vaccum.
#10
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vaccum you say. i guess ill have to get some hose soon. i cleaned out the BAC. it seems ok, is there anyway to adjust the bac or does it just work by itself? also could the bouncing idle be an air leak in the intake or would that show up on the engine warning light?
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hmmm im thinking it much be a vac problem...thats it the tb is coming off now...i think the holes from where the throttle plates i removed must be leaking air so ill get some more jb weld and fix that.
#16
While were at it, my car idles like ****, sometimes it does idle sometimes it doesnt. Everytime I rev my motor up or come down from high rpms, like after a race, my idle will just drop fast till it dies. Any ideas? I replaced my vacuum lines the other day but I dunno. None of this started till I put that new throttle body on...
#17
HAILERS
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Hello. Just a word. The hose that are connected to the oil injector spider are NOT vacuum hoses. Check it out for yourself. It's quite impossible for the oil injector hose to cause a problem of your type. The worst scenario is that the hose would crack/fall off, and cause a minor inlet of unfiltered air into the intake.
#18
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ok well this is all good info, ill post tommarow when i get to work on it more...neighbors dont like the rex running at night...together we can conquer evil idle problems
#19
zoom zoom go boom
Having same problem
Mine is doing the same thing. Regardless of the temperature it will rev up and down. I adjusted the TPS and the BAC but to no avail. When it does idle ( for a couple of seconds.) It idles perfect. But then it goes back in to the rev cycle. Up and down, up and down, you get the idea. Its pissin me off. Cause with a full 3 inch catless race muffler exhaust its a little hard to be discreet in traffic, hell much less order something in drive thru when your car wont stop reving it self. People ask me why it does that I'm just like "Its breathing"
#20
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(BDoty311)
You have a fuel-line problem. Change fuel filter. Check fuel pump. Or injectors could use a cleaning. Dont mess with your throttle body until you know for shure.
You have a fuel-line problem. Change fuel filter. Check fuel pump. Or injectors could use a cleaning. Dont mess with your throttle body until you know for shure.
#21
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fuel filter was changed 10,000 miles ago and my injectors were cleaned ~5000...and i run injector cleaner every few tanks. i guess it could be the fuel pump...ive always suspected my fuel pump was bad...any way i can check for sure?
#22
You have a fuel-line problem. Change fuel filter. Check fuel pump. Or injectors could use a cleaning. Dont mess with your throttle body until you know for shure
#23
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Originally posted by HAILERS
Hello. Just a word. The hose that are connected to the oil injector spider are NOT vacuum hoses. Check it out for yourself. It's quite impossible for the oil injector hose to cause a problem of your type. The worst scenario is that the hose would crack/fall off, and cause a minor inlet of unfiltered air into the intake.
Hello. Just a word. The hose that are connected to the oil injector spider are NOT vacuum hoses. Check it out for yourself. It's quite impossible for the oil injector hose to cause a problem of your type. The worst scenario is that the hose would crack/fall off, and cause a minor inlet of unfiltered air into the intake.
#24
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definately a vacuum problem. My '87 n/a did the same thing. Idled fine cold, but when warm would surge to 1400 and then back down constantly. Went the whole TPS and everything else route to no avail. Finally took it to someone who knows these FI systems and he found my water thermo valve and block to be clogged with coolant deposits due to age. That's where the vacuum problem was coming from. FSM has a way to check the valve and the block is just a visual inspection. Replaced both and it happily idles at a steady 750. Just another thing to possibly check, not saying that's definately your problem.
#25
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i think i fixed it...i had to adjust all those little screws on the TB and i finially got it all idlin' perfect...so far. however im very optimistic b/c i know my car and she doesnt act good for very long haha. anyways ill drive it around today and see what happens. i still think it needs a new fuel pump though