Barely wants to start, when hot! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-22-2005, 07:03 PM   #1
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Default Barely wants to start, when hot!

I've got another situation here with my bonnie. Already have a problem with a slight heating temp of the engine, probably my coolant temp sensors which is being dealt with for now. After driving for a while, stop and go, traffic.....(New York City), I shut off the engine. When I start the car again, she barely wants to start, I guess that'* what you call a HOT START or what?!

Is this because the engine temps are to high, due to the coolant temp sensors going bad, or what? Every ten minutes I have to keep my eye on the temp gauge, which is annoying. According to the service manual for this year vehicle (198, it states that driving for a while would cause slight temp readings. Temp gauge sometimes reads at the 3/4 mark and almost to the red line which is not good.

Again I 'm hoping it'* the coolant temp sensors.
OK dudes and dudettes, hit me with your best shot on this.
Thanks again.
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Old 09-22-2005, 07:32 PM   #2
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sounds nothing like the coolant temp sensor but low coolant levels or blocked coolant passages [most likely in radiator].

If you haven't already, check your coolant level in both the radiator and in the overflow bottle.

If that is the case, I have had the engine up to about 3/4 on the gauge and the car stalled and it too did NOT want to start, not for the life of her. Pumped the gas a little and she stumbled around but eventually fired up. It'* the heat, the coolant temp sensors are probably working just fine. Best way i've found to cool down a car, turn the heat on. that easily kills 1/4 on the gauge if too hot.
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Old 09-22-2005, 07:34 PM   #3
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Are the fans coming on, at 3/4 (I have never seen mine even to 1/2) both should be on HI. If the fans do not come on at slow speeds the temps can go through the roof.
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Old 09-22-2005, 09:29 PM   #4
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oh yeah, totally forgot about the city. if they don't, to test the associated wiring [minus sensors] is to do the procedure to extract codes from the ECU. This trick apparently doesn't work on 91, and i don't believe 90 either, but it works in my 89. Hopefully the 88 too. ANyways, jumping A and B turns on both the high and low speed fans..
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Old 09-22-2005, 10:01 PM   #5
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Quote:
Originally Posted by padgett
Are the fans coming on, at 3/4 (I have never seen mine even to 1/2) both should be on HI. If the fans do not come on at slow speeds the temps can go through the roof.
There are two fans, but I didn't know that they both should work at two speeds. I assumed the smaller fan was for the AC, or heater? Also what is the best way to flush the radiator of the rust and mess? This would be a great solution without changing the sensors. Something had to be done about this. .
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Old 09-22-2005, 11:03 PM   #6
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Removing the lower radiator hose will drain the most of the coolant. Flushing is a little more difficult, i'd personally just run straight water for a couple days then drain that again, and repeat. Some will disagree iwth running straight water, but I do it, and have had the same water in my radiator for two or three months... it'* still real clean. Once my car is treated to a couple gallons of gas, I will fire her up... for the first time in a month, and clean that crap out, but I guarantee you that'* some real clean water. Just gotta make sure you use distilled water... tap = crap
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