I never really noticed this until recently. But ever since I installed my HO intake manifold and 56mm TB with the Fontana Flange my car idles at 550RPM. This seems a little low to me, or is it about right? What does everybody else idle at with their HO swaps? If this is to low of an idle how do I fix this? What could cause this problem? I have a feeling that this possibly could be related to my random dieing issues, (which has not happened for over a week now). Any ideas guys?
In the planning stage for an all American TRD Cavalier.
My 99 z24 idles at 500-550, when I get HPtunners i'll raise it a little.
PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO
So your also idles at around the same rpm? Well, glad to know I'm not the only one. Do you or have you had any problems with yours dieing on you while in gear when you let off the gas? Guess I'll have to order HPT sooner than I thought.
In the planning stage for an all American TRD Cavalier.
i have a 99z24 and mine idles about 500-600. i think thats just normal

Im a Xbox 360 fanboy...and damn proud of it!!
You have an auto...what do you expect? 500-600 is normal
Z24HO wrote:So your also idles at around the same rpm? Well, glad to know I'm not the only one. Do you or have you had any problems with yours dieing on you while in gear when you let off the gas? Guess I'll have to order HPT sooner than I thought.
I had a problem with the car dieing recently due to a bad ground....It might not be your problem, but wouldn't hurt to check.
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"Youth in Asia"...I don't see anything wrong with that.
Auto? Normal is around 900 rpm.
John Lenko wrote:Auto? Normal is around 900 rpm.
Really?...Out of curiosity then, why do people suggest that vibrations from solid mounts are felt worse with the autos? I feel little to nothing around 1000 RPM's. (sorry if it sounds like I'm trying to be an ass, Lenko, but I'm not).
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"Youth in Asia"...I don't see anything wrong with that.
My 2200 idles at like 550-600 also... is this abnormal? if so whats a recommended fix?
Lenko, i do not want to question your vast knowledge base, but i taught you have even said before 500-600 is normal...
PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO
98 auto z24 stock, idle is 750 rpms,at least thats what the test machine at Autozone says? i run mine around 900-1000

15.2@89mph 2.171 60ft. 9.830 1/8 R.I.P. "LULU"
Oops, I'm on crack!!!
5 speed is around 900... auto is lower... like 600rpm..