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Old 07-28-2014, 09:46 AM   #1
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Need help car still stalls.

Ok so have 2003 gt. Automatic. So now I notice when the car has been running for a while it starts to act up. Rev high. When I start to stop the car it will die on me. Or the rpm will go crazy. Going under 500 to 1k. Another thing I notice with the ac on while it was doing this the car started to over heat. So I turned of ac and put on the heater and it went down. I changed out IAC and TPS. Also changed manifold radiator fan. Thermostats And there is no oil in the coolant. Havnt checked if there was coolant in oil. Any ideas. I know it's a lot. I can drive the car for a little bit to and from work. All is good. Only if I drive it for a while.


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Old 07-30-2014, 01:40 PM   #2
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Are there any dtc codes? check your vacuum lines also.As far as the overheating goes. Did you bleed the radiator coolant system?Check the heater core?
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Old 07-30-2014, 10:54 PM   #3
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Ok so no codes. Checked all vacuum lines with carb cleaner. And u thought it was a self bleeding system.


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---------- Post added at 08:54 PM ---------- Previous post was at 08:54 PM ----------

Sorry. I thought it was a self bleeding system.


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Old 08-01-2014, 01:08 PM   #4
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I do have a code. It was a pending code. Cylinder six misfire


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Old 08-03-2014, 09:24 AM   #5
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Did you get the problem fix? Check #6 COP and plug. And yes, you need to bleed your radiator system.
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Old 08-03-2014, 10:10 AM   #6
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How do u bleed the radiator a mechanic told me the gt is a self bleeding system


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Old 08-03-2014, 01:29 PM   #7
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lol well theres your problem! your #6 is miss fireing!
I actually JUST fixed this issue last week with a new COP.
Car would have iradic idle, felt heavy 2 drive and stumbly eventually throwing a code. Take the coil off #6 and check to see the condition of the boot, if its cracked or old looking that could be your issue.
If the boot and spring look fine then go ahead and pull the spark plug and check to see if its full of oil, broken electrode something like that. If that's fine, put the plug back in and go buy a new coil. I paid around 50 for mine and it comes with a one year warranty. easy fix

and as for your coolant just take the cap off and let the car run for a bit, if you don't see any bubbles coming to the top then your fine.. If you do then just let the car run until you don't.
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Old 08-03-2014, 01:36 PM   #8
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you should probably not be driving the car until you do what I mentioned. Running on 7 cylinders cant be good for your car.

and in case you don't know. Number 6 is the second cylinder on the drivers side going from front to back.
drivers side is 5,6,7,8 with 5 being at the front of the engine and 8 being closest to the firewall
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Old 08-03-2014, 04:32 PM   #9
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I thought it was on the passenger side. I was going to to take number six out out it in number one see if I pope a code for number one. I put the comp to the car again. No codes popping up yet. But then again I need to make sure it stopped stalling first. Havnt driven it cause it's too got out and leather sucks that way


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Old 08-03-2014, 04:33 PM   #10
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The cooling issue is good. Found out its because of the area I live. I'm on a military post that top speed is 25 mph. And it over heated cause I out a strain on the engine with ac on and not driving fast enough.


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Old 08-03-2014, 05:35 PM   #11
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no it should be driver side second from the front.
Mine never threw a code unless I would drive for a while letting it studder and shake and want to stall then boom CEL . scanned it #5 miss fire, was my cop.
Looks like you have had this problem for a while, and just realised your also the one with the thread about the vibration!... you basically re living what I just went threw lol its time for a new coil my friend. Pull the plug and if it doesn't look like **** then replace the cop and be done with it all
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Old 08-03-2014, 08:15 PM   #12
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The cooling issue is good. Found out its because of the area I live. I'm on a military post that top speed is 25 mph. And it over heated cause I out a strain on the engine with ac on and not driving fast enough.


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Old 08-04-2014, 08:26 AM   #13
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I'll take it apart after work today. I drove it last night. It tried to stall. But didn't. Wen I turn I the car. The Roma rev a little high and take a long time to go back down. I put the comp on it. No code. But I will take it apart and check it out


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Old 08-04-2014, 06:28 PM   #14
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I hate to disagree, but i doubt the overheating is due to driving to slow with the a/c on. Its a liquid cooled engine. Speed and high air flow is not required to keep it cool. Harleys overheat in those conditions because they are air cooled and need constant air flow to wick heat from the jugs, but cars dont work like that as long as the cooling system is in good working order.

I think you have other issues going on. Pull the 6 plug and see how healthy it is. And check you oil for any trace of water/coolant.
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Old 08-04-2014, 07:24 PM   #15
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based on the info given, these are the things I would check, if it were my car.

proper coolant level
dirt caked radiator fins
malfunctioning radiator fan (installed backwards maybe?)
malfunctioning thermostat

if those are good, id look into these

improperly installed intake manifold
warped/damaged heads
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Old 08-04-2014, 08:18 PM   #16
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Ok so for sure I know. Fan is brand new. I put it on myself. Correctly. Just did full service. Everything. No oil in radiator. And no coolant in oil. I will have to check the radiator. If it's clogged. I do know the radiator was very dirty. I did a flush I it. And I put the manifold on myself. That was done right. No leakin anymore from there.


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Old 08-05-2014, 10:41 AM   #17
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Sounds like a clogged radiator for the overheating problem. Flushing a badly clogged radiator won't full remove the deposits. One other thing to check is to make sure the new fan you installed is spinning in the correct direction. I saw that problem on a VW once due to a mis-wired or incorrect model fan on the car. It cooled fine when driving but the car would overheat in bumper to bumper traffic or slow driving.
Just a thought.
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Old 08-05-2014, 06:33 PM   #18
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Is the radiator dirty on the outside?

How about the thermostat?

Did you follow the correct torque sequence and settings when replacing the manifold? Did you thouroughly clean the heads at the mating surface?

Just ideas.
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Old 08-05-2014, 10:10 PM   #19
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The radiator looked cleaned. I cleaned it again. But it didn't look bad. It looked new. I followed the bolt patter on the manifold. But didn't have a torque wrench. Just mad sure I didn't over tighten. I dot see nothing leaking. Checked coolant. No oil. Now I did see a little bit of coolant running on the side under the cap. Ran the car. Didn't see any leaking.


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Old 08-05-2014, 10:11 PM   #20
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So also checked the spark plug today. It looked fine and he cap looke good. I'm about to give up and give it to the mechanic on base to see if he can fix it. He's much cheaper than going to Firestone.


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Old 08-06-2014, 07:12 PM   #21
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I dont know the symptoms of over or under torqued intake bolts, but with the intricate nature of such a part, proper torque values are pretty important.

How bout the thermostat? If you have some rtv sealant, you could probably just remove the thermostat and see if the overheating goes away.
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