Quote:
Originally Posted by cmhass2
thanks for the response. Here is some extra info.
1991 ZR1 80k miles, aftermarket exhaust, i have not replaced the injectors, i also use platinum plugs and aftermarket wires, florida car (just moved it from ohio 2 weeks ago), I'm not sure if the coolant is the specfic type for the zr1 (had a heater core replaced and not sure what they put back in), I used one of those infrared thermometers and put it on both lines and both showed about 190's, but there are many times I drive in traffic (especially now in FL) where the gauge get very close to the 260 mark( i have heard c4 vettes are notorius for dash cluster problems that cause the reading to be off). However, infrared thermometer never gets over like 220-230. I had the coolant temp sensor checked when I plled the plenum and was told it was ok.
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Better.
First things first.
Tell us about this knock.
When is it.
My bet is at idle.
Speaking of idle, how is your idle?
If your car is running right you should be able to balance a nickel on edge on the top of your plenum.
I kid you not.
If it's got a miss at idle, you are hearing your dual mass flywheel rattle.
First thing that comes to mind is fuel injectors.
It's probably time to replace 'em.
I'm gonna guess that Florida is a little hotter than Ohio this time of year
, and yes, your car will run hotter, especially in traffic.
You might want to consider buying a prom that turns on the cooling fans at lower temps to help moderate underhood temperature.
But I'd recommend that you clean out the radiator first.
It's quite a chore, but you might not have to break open your cooling system if your radiator is full of bugs and dirt.
Coolant, ONLY use the green stuff. Otherwise you risk losing head gaskets.
Do a search on coolant, there's quite a few posts about it.
If your coolant is anything other than good old green dexcool you could be in an expensive world of hurt.
TomC
'Crabs