2003 Mountaineer stalls in warm weather. Cool or cold weather never stalls. Stalling happens at different speeds but mostly around 20-40 mph. No warning just stops. Dearler checked for codes but nothing shows up. 60 thousand miles on it.. One dearler said it could be the air sensor. I have changed the air filter fuel filter have new battery new alternator. All this was replace last summer. It acts like it not getting any fuel or its not getting enough.
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Re: Stalling around 15 30 mph
I would try insoluating the fuel lines anywhere they go past hot parts.I would also run some fuel cleaner in with a few tanks of gasoline. It has done wonders on my truck of 189k.
Lean or no fuel related problem do not set codes. Too much unburned fuel sets codes.
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Dec 12, 2010 - 14 posts - 14 authors
Learn more about Mercury Mountaineer at the Edmunds.com Car Forums! ... Light came back on but no more stalling at speed. ... I have the same stalling at low idleproblem (under 500 RPM) with my 2003 Mountaineer 4.6L V8 AWD. ... My computer is telling the engine to rev at a high RPM on startup, then ...
You don't say what make of car but it's about the same for all. Your problem is the choke adjustment. The choke raises the idle when the car is cold and after warm up drops to normal. You are doing the chokes job when you hold the pedal down, once its warmed up the choke no longer functions till cold again. So check the choke and the high idle speed adjustment. Simple fix. Hope this helps mike
The stalling, if you are talking about when the engine is cold, is due to a failure of the "Cold start routine". Should this be the case, the defect is due to a temperature sensor failing to send a signal or the PCM failing to use the signal.
Now if this stalling is when the engine is warm in cold weather, it can be due to the ISC(idle speed control) solenoid. One reason the stalling is reduced in the Summer months is the A/C has an idle speed step-up which works when the A/C is used.
Another part which can cause stalling is the "Cam Phaser" in some Ford designs. The A/C step-up may mask this problem too. This is a problem in 2 camshaft motors. It requires more intensive inspection. Try the cheaper causes first. The Cam Phasers would be expensive.
My 2003 nissan sentra would get hot and stall out even in middle of highway doing 70 mph. The guages would go up and down. Would not start up all the time after stalling. had to cool down first. Nissan said it was head gasket, and wanted to charge 1000.00 for the job. I took to local dealer who charged me 550.00. Works fine ever since. Nissan dealer said they do like 3 head gaskets a week on the sentras. They have crappy ones in original parts. They have not recalled though.
Have you changed your fuel filter? Pump ok otherwise would be doing it all the time. Injector pump on some of these has a thermal advance solenoid on the side of the pump If so check power going to it Also check glow plugs and after timer
Most common cause of stalling for Lincolns in that era is the TPS (Throttle Position Sensor). It regulates fuel mixture, idle speed etc. A bad TPS will usually act up in one of two ways:
When cold, car continually stalls
When warm, car stalls when slowing down (especially if AC is on)
As far as valve cover oil leak, it's a problem that should be addressed to keep oil from fouling your spark plugs but highly unlikely to be the cause of your stalling problem. Hope this answers your question. All the best.
Have you chg.fuel filter and had a fuel pressure test done? Does it have spark after it stalls? Fuel pumps are a common problem, they work when cold get warmed up they quit, after a while quit all together. Do the fuel pressure test.