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Old 08-19-2006, 15:55   #1 (permalink)
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Question 98 Taurus Stalls In Hot Weather

About a month ago we had a very very hot day, and my car which is automatic transmission stalled about 5 times. Power would still all be there, but the engine would shut down, and I woudld have to turn it off and start up again. I figured this must of been the engine over heating, so i drained and flushed the cooling system. I thought the problem was solved until today. We had another hot day today it was over 100F. You could feal when you were starting again after a red light, you could feal the engine want to stall, and you could watch the RPM fall and then spike up again when you gave it some gas. Then it finally stalled on me, luckly I was close to home, and just came straight home. Does anyone know what could be causing this. Also on both ocasions when this happened I had the air conditioning on.
Thanks, Dave
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Old 08-21-2006, 14:36   #2 (permalink)
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Re: 98 Taurus Stalls In Hot Weather

Hi, Mensink. I just bought a 98 Taurus myself and the exact same thing is happening. The day I drove it home - barely 2 miles - the dang thing stalled when I went to park. Two days after that, same thing. And today, it stalled coming to a stoplight, and again seven more times as I tried to parellel park. All three days were in the high 90's or over 100. No problem in cooler weather. I wonder what gives?

Simmie
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Old 08-24-2006, 08:44   #3 (permalink)
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Re: 98 Taurus Stalls In Hot Weather

Simmie, Was your Air Conditioning on when it happened?
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Old 07-15-2007, 22:11   #4 (permalink)
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Re: 98 Taurus Stalls In Hot Weather

Quote:
Originally Posted by Mensink
About a month ago we had a very very hot day, and my car which is automatic transmission stalled about 5 times. Power would still all be there, but the engine would shut down, and I woudld have to turn it off and start up again. I figured this must of been the engine over heating, so i drained and flushed the cooling system. I thought the problem was solved until today. We had another hot day today it was over 100F. You could feal when you were starting again after a red light, you could feal the engine want to stall, and you could watch the RPM fall and then spike up again when you gave it some gas. Then it finally stalled on me, luckly I was close to home, and just came straight home. Does anyone know what could be causing this. Also on both ocasions when this happened I had the air conditioning on.
Thanks, Dave

Mensink: I have a 98 Escort--very similar vehicle,-- and we have many days over 100F(38C) where I live. Recently, my Escort has been doing the same thing--stalling repeatedly when the temp is over 35C(95F), but no problem when its cooler. I'm totally stumped. I thought it might be a vapor lock, so I blew out the fuel lines, changed the filters, etc. but no joy--its still stalling, and the forecast is for continued hot weather for the next six or seven weeks. Did you find out what caused the problem with your Taurus? Might help me fix the Escort.
Any info would be appreciated.
Thanks, Hugh
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Old 07-16-2007, 11:16   #5 (permalink)
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Re: 98 Taurus Stalls In Hot Weather

A few simple things to check:

Check your fuel pressure running and bleed-down. Post to the forum if you don't know what that is for your model/engine type. You'll need a fuel pressure gauge.

To check spark problems with wires, plugs, coil packs, spray down those components at night while idling with a spray bottle. Follow the blue arcs to their bad part.
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Old 07-24-2007, 16:04   #6 (permalink)
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Re: 98 Taurus Stalls In Hot Weather

I have a 98 Taurus that did the same thing for the first time yesterday. I was able to get it to a mechanic as it was doing it and he drove it and experienced the issue as well. The engine was so hot he couldn't even check anything, but by morning the problem was gone. It was approx 100 degrees here yesterday and I did see the temp rising in the engine.
He said he was only taking a guess, but believes it was a vapor lock, and mentioned that it could be due to the ethanol gasoline vaporizing at lower temps. He suggested that I might want to try finding gasoline that doesn't have an ethanol component (which is getting more difficult) when we are expecting hot days... I do not know if this is true, but do know that the car is running like a champ today with the weather at 85 degrees. I would be very curious to see if anyone else is having luck tracking down this problem.

By the way, the issue did start when the air conditioning was running. I switched to the heater and full fan, and saw the engine temp drop which did start to eliminate the stalling out problem. Later when the temp rose again (without the A/C on and I had the stalling issue again). I don't believe it is related to the A/C.
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Old 07-24-2007, 22:52   #7 (permalink)
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Re: 98 Taurus Stalls In Hot Weather

Vapor lock? Vapor lock? On a fuel injected engine? Has your mechanic been to school in the last 10 years? When fuel is under 40-50lbs of pressure, it doesn't vaporize. The fuel pump is in the tank and the fuel is pressurized from the tank all the way to the injectors. That's precisely one of the reasons WHY the fuel is pressurized at such a high psi--to PREVENT vapor lock. If he thinks you've got vapor lock, he needs to get himself into a current training session--pronto.

dac122 is more on track with his advice. Start with a fuel pressure test. Then, check the operation of your fuel pressure regulator. Other things to check include the Idle Air Control valve (very common problem), EGR valve and DPFE sensor (also a very common problem). All of these can (and do) cause stalling and hesitation.

The IAC valve should kick the idle up when the A/C is on. If it doesn't, you're going to have stalling problems at acceleration.

I wouldn't be so quick to rule out the connection between the stalling and the A/C. When your A/C is on, you're powering the blower motor, the A/C clutch, and both cooling fans at the radiator are running full tilt--especially on 100° days. That's a full electrical load on an engine. If the idle isn't right, you're going to have stalling problems.
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Old 07-25-2007, 07:13   #8 (permalink)
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Re: 98 Taurus Stalls In Hot Weather

Thanks for the reply. I appreciate the advice. I thought Vapor Lock went out with carbs, but took the mechanics word when he said he thought this might be the problem.

One question with your suggestion of things to check... Does the car need to be experiencing the symptoms while I do the tests you suggest or will I find issues regardless. I'm wondering b/c the car is running perfectly now.

Thanks again
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Old 07-27-2007, 01:11   #9 (permalink)
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Re: 98 Taurus Stalls In Hot Weather

My 98 Escort was stalling when the weather got over 35C (95F or so) --see previous post. I finally got a fuel pressure guage the other day; measured 30-34 psi when the engine was running normally (manual says 30-45 is normal). After about an hour of running around town, the engine stalled, and pressure was down to about 10psi. Installed new fuel pump, haven't had a problem for three days (knock wood) but its not as hot -- only about 30-33C this week. If the stalling recurrs I'll post again, but hopefully this is the solution.

Thanks guys.

Hugh
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