it has happened a few times now..Start car drive and shut off...try and start car right away and she will turn over and not fire...let car sit for 4-5 minutes and then she is fine..Had one guy say it is the coolant temp sensor..What ya think?? And where is it on my car..'98 5.7 iroc

 

you mean '89? lol but im a little unsure of what your saying, you drive it and shut it off or drive it and it stalls?

But 350TPI?

Whats been checked so far?

 

Ya my bad...'89 OK here is an example...Driving for 15 minutes or so. Pull up in front of a store..Shut car off...Guy come out and asks if I can move my car because I am blocking him in...I try and start car. Engine will turn over and not try and start...If I sit and wait a few minutes she will fire right up and be fine...Happened 3 times since i bought the car..I have checked nothing cause I don't know where to start...

 

I had a coolant temp sensor go bad and was actually that way for a few years before I fixed it. What would typically happen is the car would spit and sputter after it warmed up (approx 10-15 mins)... came close to cutting out a few times but never actually died on me though. I stored the car every winter and this would happen each spring when I took the car out of the garage. After a week or so the car would be fine for the rest of the summer.

Your CTS may be further gone than mine was because mine would start functioning properly after it got the "rust" out in a week or two.

On the plus side, a new CTS is only a few dollars and it's only a few minutes to fix because it sits right up there on the front of the intake manifold. Literally, it's just a few minute's job (without even any bending over or hard-to-reach spots)... as quick as getting gas. Just be careful not to strip any threads because most likely it's been in there since '89 and use some sealant on the threads when you screw in the new one. You should be able to pick up the sensor and sealant at Canadian Tire... and install it on the parking lot.

Where in Newfoundland are you by the way? There aren't many IROCs on the island (never were).

 

I had another guy say its the coolant temp sensor...Your profile says Troy Michigan...But with the last name Butt and knowing about the "Island" I am thinking you are from the Northern Peninsula...And yes you are correct not many Iroc's around here...Larry

 

ok sounds real stupid but, cts are problematic and are cheap. my issue was like i said really stupid if the cts isnt the fix replace the starter my old setup cooked the starter and it wouldnt start right after it warmed up and i tired to restart after i shut the engine off i replaced the starter and shielded it correctly this time to ensure the heat wouldnt kill it then i have had no issues going forward but try the cts first its cheaper lol.

 

Carbonear... moved to the Detroit area five years ago (to work as a GM Powertrain Engineer actually... but thirdgens are a distant memory to GM now). There was a time when I knew almost every IROC and their owners in Newfoundland... there were probably only 5 or 10.

 

My wife is from Spainard's Bay..I called Crappy tire..Young fella didn't even know what an Iroc Z was.. Napa sells them for 20.47...Gona have to make a scoot and pick up one and try...Thanks for help...Larry ( in Mt. Pearl)

 

Picked up a new sensor and installed...car idles and runs so smooth...What a difference....Thanks for the info...Larry

 

Must be a Newfoundland thing, mynes in Baine hr on the burin pen and its the same way, when its cold first flick of the key, whe its hot, roll and roll..then it fires up with a bit of black smoke..looks bad..the last one i hadwas the same, never ever got it fixed, have to try this out on my 87 tpi...thanks guys.

 

Most likely the CTS... the black smoke on start-up is another giveaway that it's on its last leg. That should clear up immediately when the CTS is replaced.

Perhaps the cold, damp climate in Newfoundland corrodes them more quickly. My first one lasted 7-8 years before it started acting up, then another 7-8 before I actually changed it.