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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


98 Monte Carlo starting problem.

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98 Monte Carlo starting problem. Empty 98 Monte Carlo starting problem.

Post by 74MonteCarlo Sat Jun 12, 2010 10:58 pm

Some older members may remember last summer when I was having starting problems on my 98 MC. I went all Winter with ZERO issues. They're back! Only difference: hot, humid weather. WTF. Only when it's hot outside is when it happens. It ended in the Fall when it cooled down, and our first day of 80+ degree weather(about 3 weeks ago), it wouldn't start. Happened last night and again tonight. Me and my dad are totally baffled.

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Post by coreys73chevelle Sat Jun 12, 2010 11:00 pm

any check lights on? check engine light on?
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Post by 74MonteCarlo Sat Jun 12, 2010 11:05 pm

Service Engine is on, but even when it was off it happened. I think it's for the A/C. I think it may have a tiny little leak and the free-on is low. When we charged it the first time, it went off. Went back on again when I started using it. I've done every process of elimination possible. Only conclusion: HOT WEATHER.

List of things I have replaced thinking it was the problem:
Starter
Battery
Ignition key

I think there's something else I'm forgetting...

I was going to get a new ignition switch, until I found out it was $125. Not gonna spend that if I'm not 100% sure that's the problem.

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Post by coreys73chevelle Sat Jun 12, 2010 11:11 pm

coil packs?
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Post by 74MonteCarlo Sat Jun 12, 2010 11:12 pm

Wouldn't that be all time time?

What baffles me is it's only when it's hot!

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Post by coreys73chevelle Sat Jun 12, 2010 11:15 pm

does it crank or is it like a dead battery?
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Post by coreys73chevelle Sat Jun 12, 2010 11:20 pm

could be ignition control module, fuel pump relay OR it could just be bad vapor lock witch you get a new gas cap or leave it loose and let it air out then try to start it
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Post by coreys73chevelle Sat Jun 12, 2010 11:22 pm

ignition switch could be it also. http://www.srtforums.com/forums/f25/hot-day-car-wont-start-449614/ read the last post on the 1st pag says i was it
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Post by 74MonteCarlo Sat Jun 12, 2010 11:25 pm

Like a dead battery. I forgot to mention, that after 2-5 minutes letting it sit there, it will then start, NO problem.

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Post by JB2wheeler Sat Jun 12, 2010 11:32 pm

Does this happen the first time you crank it in the morning or does it happen after you have been driving it and then shut it off and come back in a short time and try to crank it. JB
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Post by IndyG3 Sun Jun 13, 2010 1:08 am

Is it humid when it's hot? You could possibly have issues with connectors...
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Post by HDHugger Sun Jun 13, 2010 2:24 am

Did you check your blinker fluid levels? Razz

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Post by 74laguna Sun Jun 13, 2010 4:01 am

if the key has a chip in it you need to check the lock cyl. wires for the theft system
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Post by 74MonteCarlo Sun Jun 13, 2010 7:54 am

JB2wheeler wrote:Does this happen the first time you crank it in the morning or does it happen after you have been driving it and then shut it off and come back in a short time and try to crank it. JB

It happens at random. It doesn't matter when I last started it.

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Post by 74MonteCarlo Sun Jun 13, 2010 7:55 am

IndyG3 wrote:Is it humid when it's hot? You could possibly have issues with connectors...

Doesn't matter. Just anything 80 or more degrees.

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Post by 74MonteCarlo Sun Jun 13, 2010 7:56 am

74laguna wrote:if the key has a chip in it you need to check the lock cyl. wires for the theft system

I have a brand new key. Next "fix" is to disconnect the anti theft module and bypass it.

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Post by The Dude Sun Jun 13, 2010 10:05 am

This is the reason I don't screw with newer cars anymore. I spent over $2k both working on it myself & at the dealership trying to find a simple $50 problem on the Taurus. I ended up finding & repairing the problem, not the dealership.
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Post by 74laguna Sun Jun 13, 2010 10:31 am

the key is not the LOCK CYL. will
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Post by 74MonteCarlo Sun Jun 13, 2010 1:30 pm

I know, I'm not STUPID! When the problem first occurred, one suggestion was to get a new key made, because maybe it wasn't making good contact due to being worn out, for the old one WAS worn out, and even bent. And besides...that doesn't sound like something that would happen only in heat anyway.

Next time it happens, I'll try Corey's vapor lock suggestion.

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Post by 74MonteCarlo Wed Jul 14, 2010 9:05 pm

Well, after a lot of diagnosing, it was narrowed down to the anti theft module. Picked up two new ones at the salvage yard on Monday for $5 a pop, and put one on that day. So far so good...

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