I have a 2001 Blazer, 4X4 with 158K miles on it.

I have replaced the: distributor (and cap and rotor), plugs, wires, new EGR, coolant temp sensor, Cleaned the throttle positioning sensor, cleaned the IAC and yet the Blazer idles at 350 RPM to 400 RPM's is this normal?

I checked to see if I was pulling any codes that didn't kick off the idiot light there were none.

I did a seach but every Blazer has it own quirks.

Thanks

Jim

 

Under what conditions does it idle at that speed? Seems low even for fully warmed up with the transmission in gear, but unless it is stalling on you, I'm not sure I would mess with it.

 

I just took a ride before about 20 highway miles with the A/C off in 95Degree(Florida) weather.

when I drive around town.

Do You think it "could" be the IAC sensor? When I searched before it seems likely that it could be that but I need another opinion.

BTW 2 years ago I installed a ebay coil, but if it was that I would get a power drop off at high speeds, would I not?

Thanks

 

So this was a hot idle.

Was it with the transmission in gear or out of gear? If in gear, what was the out of gear idle speed or vise-verse?

Does it ever try to stall?

 

without in gear 400 With in gear 350-300 rpm

in gear with A/C on 300rpm. not in gear with A/C on 350-400

Has not tried to stall BUT I DID throw a code about 2 weeks ago when it went down to 300RPM

 

Let me rephrase the last question I posed... What has you concerned about the RPM as stated?

 

should the idle be at 500 RPM's? and when the a/c kicks on shouldn't the RPS remain consistent in gear or not?

I remember with my 1995 Blazer it idled at 500 RPM's and when the A/C kicked on it remained constant 500RPM's

and if I remember correctly my 1995 blazer had only 42K miles on it. so that is what I am basing it from.

 

I just had a bad IAC pump. The truck would periodically stall out unless I had my foot on the gas. Idling would sometimes be rough.

I was getting the famous P04*** error code (or whatever the secondary air pump code is). Replaced the pump and the code went away and so did the stalling/idling issue.