RPM's ARE JUMPING!?!?!?!?!?!?! HELP
03-22-2008, 03:58 PM
#1
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Location: tulsa, oklahoma
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ok, i got my car running 
, but one of my turbos went out (the back one) and also my RPM's jump around and rev high.
if i let it idle for a while (usualy sits at about 1000) the RPM's will raise to 1200 and then to 1500 back and forth.
if i move the stick shift a little (auto trany) then it stops for a while, and goes back to about 1000 RPM
it says that it should sit at 720 RPM's in "P" (park). at idle
also is there an easier way to check and make sure your turbos are good? without taking off all that crap?
if i let it idle for a while (usualy sits at about 1000) the RPM's will raise to 1200 and then to 1500 back and forth.
if i move the stick shift a little (auto trany) then it stops for a while, and goes back to about 1000 RPM
it says that it should sit at 720 RPM's in "P" (park). at idle
also is there an easier way to check and make sure your turbos are good? without taking off all that crap?
03-29-2008, 09:53 PM
#2
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you can pull the elbows off the front of the turbos where is goes to the filters and grab the compressor wheel and see if there is alot of play, and also look for alot of oil in the intercooler and/or intercooler pipes.
The idle problem could be the ISC, (the black thing with white connector on the UIM) unplug it and see what happens, it could be sticking.
The idle problem could be the ISC, (the black thing with white connector on the UIM) unplug it and see what happens, it could be sticking.
03-30-2008, 10:57 AM
#3
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Originally Posted by dudemaaanownsanrx7' post='897455' date='Mar 29 2008, 09:53 PM
you can pull the elbows off the front of the turbos where is goes to the filters and grab the compressor wheel and see if there is alot of play, and also look for alot of oil in the intercooler and/or intercooler pipes.
The idle problem could be the ISC, (the black thing with white connector on the UIM) unplug it and see what happens, it could be sticking.
The idle problem could be the ISC, (the black thing with white connector on the UIM) unplug it and see what happens, it could be sticking.
i took off the down pipe and messed with the turbo that way. the down pipe was all melted inside (or the honey comb stuff was) so i knocked that stuff out and replaced the down pipe (turbo spu freely) and now she screems.
but she also smokes really bad when you start it, and idles wrong.
so ill check the ISC and the UIM
thanks for all your help,
cody
03-30-2008, 11:42 AM
#4
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Posts: 76
ah yeah thats very important to get rid of the precat, it will extend the life of your turbos and help open things up alot.
If your interested i have a couple different aftermarket downpipes, one is the HKS one that works with right hand and left hand drive rx7s. I had it on the car before i went single turbo, and the other is a brand new 3" stainless one i got second hand. I dont remember what it was but its a really nice unit.
An aftermarket downpipe will be less restrictive then the stock precat and help further with spool up and the volumetric efficiency of the engine.
These cars tend to smoke more then other cars anyways... they do burn oil by design. The stock fuel maps are also quite rich. It's hard to say if your car is smoking more then it should though, but it's possible the oil seals in the turbo are leaking. You can try replacing your o2 sensor, its a relatively cheap and easy thing to do, if your old one is bad it could cause it to run even richer.
You might also check for vacuum leaks to fix your idle.
If your interested i have a couple different aftermarket downpipes, one is the HKS one that works with right hand and left hand drive rx7s. I had it on the car before i went single turbo, and the other is a brand new 3" stainless one i got second hand. I dont remember what it was but its a really nice unit.
An aftermarket downpipe will be less restrictive then the stock precat and help further with spool up and the volumetric efficiency of the engine.
These cars tend to smoke more then other cars anyways... they do burn oil by design. The stock fuel maps are also quite rich. It's hard to say if your car is smoking more then it should though, but it's possible the oil seals in the turbo are leaking. You can try replacing your o2 sensor, its a relatively cheap and easy thing to do, if your old one is bad it could cause it to run even richer.
You might also check for vacuum leaks to fix your idle.
03-30-2008, 01:35 PM
#5
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Originally Posted by dudemaaanownsanrx7' post='897481' date='Mar 30 2008, 11:42 AM
ah yeah thats very important to get rid of the precat, it will extend the life of your turbos and help open things up alot.
If your interested i have a couple different aftermarket downpipes, one is the HKS one that works with right hand and left hand drive rx7s. I had it on the car before i went single turbo, and the other is a brand new 3" stainless one i got second hand. I dont remember what it was but its a really nice unit.
An aftermarket downpipe will be less restrictive then the stock precat and help further with spool up and the volumetric efficiency of the engine.
These cars tend to smoke more then other cars anyways... they do burn oil by design. The stock fuel maps are also quite rich. It's hard to say if your car is smoking more then it should though, but it's possible the oil seals in the turbo are leaking. You can try replacing your o2 sensor, its a relatively cheap and easy thing to do, if your old one is bad it could cause it to run even richer.
You might also check for vacuum leaks to fix your idle.
If your interested i have a couple different aftermarket downpipes, one is the HKS one that works with right hand and left hand drive rx7s. I had it on the car before i went single turbo, and the other is a brand new 3" stainless one i got second hand. I dont remember what it was but its a really nice unit.
An aftermarket downpipe will be less restrictive then the stock precat and help further with spool up and the volumetric efficiency of the engine.
These cars tend to smoke more then other cars anyways... they do burn oil by design. The stock fuel maps are also quite rich. It's hard to say if your car is smoking more then it should though, but it's possible the oil seals in the turbo are leaking. You can try replacing your o2 sensor, its a relatively cheap and easy thing to do, if your old one is bad it could cause it to run even richer.
You might also check for vacuum leaks to fix your idle.
and when it smokes it puffs out a BIG cloud of it and its not even gas its oil. and once its running its like its cold outside and smokes a little for a while.
03-30-2008, 08:50 PM
#6
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Originally Posted by 7's-for life' post='897488' date='Mar 30 2008, 01:35 PM
k, i am actually looking for a down pipe, will one of them fit a stock pipe setup, and whats your lowest price cause i need something cheap.
and when it smokes it puffs out a BIG cloud of it and its not even gas its oil. and once its running its like its cold outside and smokes a little for a while.
and when it smokes it puffs out a BIG cloud of it and its not even gas its oil. and once its running its like its cold outside and smokes a little for a while.
could be the oil seals on the turbo, they do tend to smoke more when they are cold.. keep an eye on your oil level and see how much it goes down. I think a quart of oil every 3000 miles is about what they normally use.
I know the HKS is for a stock exhaust system, the other is 3" i think, i never had it installed so im not sure if it will bolt up to the stock exhaust or not.. ill send you a PM with the price.
03-30-2008, 09:18 PM
#7
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rx7's tend to smoke more when cold ***
Whether turbo oil seals would leak more or not im not sure?
Was the car flooded at all while you were trying to get it running? If so maybe there is excess fuel in the oil causing it to be thinner..
Since it's been sitting so long the car probably is anxious to be driven around, and things might start clearing it up the more you drive the car.
Whether turbo oil seals would leak more or not im not sure?
Was the car flooded at all while you were trying to get it running? If so maybe there is excess fuel in the oil causing it to be thinner..
Since it's been sitting so long the car probably is anxious to be driven around, and things might start clearing it up the more you drive the car.
03-31-2008, 03:28 PM
#8
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Originally Posted by dudemaaanownsanrx7' post='897507' date='Mar 30 2008, 08:50 PM
could be the oil seals on the turbo, they do tend to smoke more when they are cold.. keep an eye on your oil level and see how much it goes down. I think a quart of oil every 3000 miles is about what they normally use.
I know the HKS is for a stock exhaust system, the other is 3" i think, i never had it installed so im not sure if it will bolt up to the stock exhaust or not.. ill send you a PM with the price.
I know the HKS is for a stock exhaust system, the other is 3" i think, i never had it installed so im not sure if it will bolt up to the stock exhaust or not.. ill send you a PM with the price.
well the problem is that it wasn't cold out, it just smoked like it was a cold day (like when its about 30 deg. out and you start cold engine).
and thanks for that tip.
03-31-2008, 03:29 PM
#9
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Originally Posted by dudemaaanownsanrx7' post='897511' date='Mar 30 2008, 09:18 PM
rx7's tend to smoke more when cold ***
Whether turbo oil seals would leak more or not im not sure?
Was the car flooded at all while you were trying to get it running? If so maybe there is excess fuel in the oil causing it to be thinner..
Since it's been sitting so long the car probably is anxious to be driven around, and things might start clearing it up the more you drive the car.
Whether turbo oil seals would leak more or not im not sure?
Was the car flooded at all while you were trying to get it running? If so maybe there is excess fuel in the oil causing it to be thinner..
Since it's been sitting so long the car probably is anxious to be driven around, and things might start clearing it up the more you drive the car.
its been running good it just smokes and the RPM's jump around at idle (in park) from 1000-1500 back and forth, until i move the stick around then it stops for a while.
04-01-2008, 09:28 AM
#10
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Posts: 76
check your TPS it could be out of adjustment. there are several places on the net that show how to adjust the TPS correctly. other things to check would be the dashpot, but thats usually sysmtoms caused when you get off the gas the rpms jump around or stick, and also the ISC, a black thing with white terminal mounted near the throttle body on the side closest to the firewall on the UIM. This is what the ecu uses to control idle under different loads such as when the A/C is turned on. Unplug it and see if they settle down. it could be sticking.