mclark
SHO Member
Hey guys having problems with idling on the 94 auto sho, I have pulled the codes and got codes 327,411,521 and a 632 , I have replaced sensor after sensor any ideas,
High idle when put in park
- Thread starter mclark
- Start date
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here is the code reference link
two of the codes are from not doing something during the test
Did you already try replacing the idle air control valve?
Does the idle fluctuate or just stay high, what rpm
One of the codes is related to the EGR, on my 94ATX, I would get a high idle that fluctuated. cleaning out the nostrils in the intake, feed hoses, etc. didn't solve the issue until I replaced the EGR sensor. Did you replace that sensor already?
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mclark
SHO Member
Sorry for the late response, yes I have replaced egr sensor, it does fluctuate from around 600 to 900rpms. When put in park it stays high and idles at 1900 rpms and sometimes at 2200 rpms . All the above cleaning I have done,
Did you replace the idle air control unit
you can try cleaning it, but I never noticed a difference
you can try cleaning it, but I never noticed a difference
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mclark
SHO Member
Yes I have , twice
read through this thread
shoforum.com
OKAY I LIED NOT SOLVED!!! Post 11 - Idle surging - 90 SHO
On the 90, When the car is cold, the RPM's bounce from about 7-800 up to about 15-1800. It is rather annoying, it seems like the car is going to die at times. Now, once it is warmed up, (at least most of the time) it will sit there and just purr like a kitten and not even a blip, stays idling...
shoforum.com
mclark
SHO Member
Thanks, I will look into the TPS and MAF,
mclark
SHO Member
No I have not , but these things will be looked into, Thanks again
FastCAD
SHO Member
disconnect the IAB if there is no change then it's bad. It's hard to tell by cleaning and looking at it & it will not throw a code. If you have recently replaced it then make sure it is SHO specific any other will give symptoms like what you have.
I have a couple of those CHEAP. lol
U can also start the car let it warm up a couple of minutes disconnect the IAB connector shut the car off wait a couple of minutes restart let it warm up again and plug the connector back in and it might re-learn.
Best to ya.
luigisho
SHO Member
unclear, cleaned or replaced twice?? If it has failed, cleaning it will not help.
mclark
SHO Member
Replaced the iab twice, how to determine a bad egr .
BaySHO Performance
SHO Member
I had a 93 ATX come over Saturday with a bad EGR valve.
Remove the small tube from the back of the EGR valve and attach a new hose to the port. Suck on the hose. You should hear the valve moving with a crisp thunk. If not, replace it. His EGR had a barely audible hiss when I did the same. Duralast EGR270 from Autozone for 93-95.
Now start the car with the hose still attached. Suck on the hose again. If the revs go down, the nostrils are clear. If not, the revs won't change.
mclark
SHO Member
Still high idle after doing the re-set , and replacing egr, will look at maf next . What to look for with the PCV , and what is the the best way to check for vacuum leaks . Thanks
BaySHO Performance
SHO Member
Spray starting fluid all over with the engine running. Revs will increase if a vacuum leak is present.
mclark
SHO Member
Hey guys just an update , I think I have found my idle problem, the 12mm bolt that secures the butterflies vac canister is losing vacuum,what is recommended to seal it ,
mclark
SHO Member
One more thing , what is the part called mounted on the vac canister bracket for the butterflies,
