This is topic Does overheating engine cause it to bog? in forum Tech Talk at Northern California Ford Owners  .


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Posted by Jim Wood (Member # 5531) on :
 
Hi,

I was at thunderhill this weekend and my 89 v8 mustang which is basically stock would bog down and was way down on power after the first couple of runs.

My question is does the engine go into a type of safe mode or something if it overheats?

I know my 03 Cobra would get heat soak and shut down, but need some advice if this is something that could be heat related before I start looking elsewhere.

The car has a Griffin radiator and electric fan.

Thanks.
 
Posted by 89Rodknocker (Member # 2951) on :
 
I believe this is right if i'm wrong someone please correct me. But when the car starts to run too hot the computer pulls timing to avoid engine damage. Thats why there is to temp sensors on the intake one for the gauge and one for the computer. I'd recommend running a mr. gasket or robert shaw high flow t-stat cools the car fast.
 
Posted by Jdub07 (Member # 2728) on :
 
my car overheated a little on Saturday...it felt the same but threw up coolant out of the radiator cap. I have a manual electric fan though (switch activated) and forgot to turn it on. Bogging no...my 89 lx would bog though when the SECOND TFI modual I had was heating up too much. Car would cut out completely. I swapped TFI's with a Motorcraft one and was golden.
 
Posted by Jim Wood (Member # 5531) on :
 
quote:
Originally posted by Jdub07:
my car overheated a little on Saturday...it felt the same but threw up coolant out of the radiator cap. I have a manual electric fan though (switch activated) and forgot to turn it on. Bogging no...my 89 lx would bog though when the SECOND TFI modual I had was heating up too much. Car would cut out completely. I swapped TFI's with a Motorcraft one and was golden.
The TFI is located on the Distributor?

When you say the car cut out, was that a momentary pause where the engine was not firing and then it would fire?

Under hard acceleration the engine would momentarily pause and then pick up again.
 
Posted by Jdub07 (Member # 2728) on :
 
quote:
Originally posted by Jim Wood:
quote:
Originally posted by Jdub07:
my car overheated a little on Saturday...it felt the same but threw up coolant out of the radiator cap. I have a manual electric fan though (switch activated) and forgot to turn it on. Bogging no...my 89 lx would bog though when the SECOND TFI modual I had was heating up too much. Car would cut out completely. I swapped TFI's with a Motorcraft one and was golden.
The TFI is located on the Distributor?

When you say the car cut out, was that a momentary pause where the engine was not firing and then it would fire?

Under hard acceleration the engine would momentarily pause and then pick up again.
At first is didn't cut out completely...it would bog then pick up downt the street then bog again then finally it would die. Still would turn over. Then fire up and same thing...about 3-4 times then I smacked it with a screwdriver and it was good as new...I went strait home and swaped it out.

Usually tfi's just go out. They either work or they don't Your issue sounds a bit different, maybe borrow someones tfi that you know is good.
 
Posted by turbo50 (Member # 6700) on :
 
I had a fuel pump that would get hot when low on fuel and overheat.

Ran fine when it was cool out or fresh tank of gas.

Took forever and a day to figure that one out.
 
Posted by turbo50 (Member # 6700) on :
 
quote:
Originally posted by 89Rodknocker:
I believe this is right if i'm wrong someone please correct me. But when the car starts to run too hot the computer pulls timing to avoid engine damage. Thats why there is to temp sensors on the intake one for the gauge and one for the computer. I'd recommend running a mr. gasket or robert shaw high flow t-stat cools the car fast.
Drove my car all the way home from Sears point after blowing the headgasket on a nitrous run.

Car was at 290-300 the whole way home (about 30 miles) never bogged down.
 
Posted by Mr2MCHVNM (Member # 6906) on :
 
hahahah everyone is soooo quick to get way off of topic, my 2000 GT gets very slow when it gets hot, I have been through 5 YES I SAID 5 Fluidyne radiators thanks to leaks where the tubes are welded to the tanks in the top corners... the car only over heated a few times during all this and every time it would go up to a higher idle to maitain a higher speed for the water pump and the as the first guy said the computer pulled out a lot of timing so it felt really sluggish... so far this has gone away as soon as the car cools down and the problem is fixxed
 
Posted by Wolfie351 (Member # 651) on :
 
Sounds exactly like vapor lock to me. But, since I am a carb guy, the EFI people here can tell you if that's even possible with a high pressure fuel system.

Now that the car has sat for a few days, how does it run now?
 




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