Hi,

A friend recommended this site as a 'wealth of information' & that is what I require....

I recently purchased a 94 TR Verada for my daughter. I have had to replace the trans computer, rack & pinion, idle speed motor, & fuel tank (old one had a leak). All of these were replaced by 2nd hand parts from wreckers. Whilst doing all of this, I had the valve stem seals replaced al well.

PROBLEM - The car dies when it is hot. If I put my foot down there is nothing, tacho drops right back but it has only stalled once (in the middle of an intersection). I can drive it for 1 hour in the morning into work & it will be fine because the ambient temp is around 18 - 20 degrees C. Driving home, I get 40 minutes in & the problem occurs due to the higher ambient temp.

WHAT I KNOW - When the vehicle stalled in the intersection, I imediately put it into neutral & restarted it. It then drove like nothing was wrong for about 5 mins. When it started playing up again I slipped it into neutral, killed it & restarted it on the fly & got about another 5 mins out of it.

Turning the vehicle off resets the problem immediately.
It was not happening after the trans comp was replaced before the rest of the work.
Fuel tank & connections to the pump etc have been triple checked.

Sounds like when my throttle body started playing up.Went on like that for months before finally packing up. It'd have no power but rev ok in neutral, put it in gear and there was nothing. Then it'd miraculously come good.

Thanks Herman,

Yesterday, when the vehicle was is in park & I put my foot flat to the floor, it gave the impression that I was pumping the accelerator up & down. As soon as I turned it off & on again (about 2 sec delay), the vehicle would happily red line. I know very little about cars but I believe it has to be something electonic.

Jim

Sounds like you may have gummed up the fuel filter with crap out of the second hand tank.

When it dies the pressure drops and the fuel flows back a bit letting a bit more get past the filter.

Id change that first, its cheap and easy to diy. :)

Hi Ol' Fart,

We had thought of that but it dosen't gell with being heat related. We still replaced the filter & have checked it out after as well.

It probably isn't heat-related, per se...

Having said that... vapour-locking fuel lines?

Cheers,
Mattt.

My MRS' KR Verada was doing this and after mucking around for a week with no success, I got a new Radiator Cap and voila, havent had an issue for over a week. Touch wood :)

Im wondering if the heat is just a red herring and it just needs to run for a bit before dying.

It could be a sensor reading high and telling the engine to shut down (there would be a computer fault error code registered if that was true)

It could be a vapour lock problem like mattt said but thats more a carby problem.

It could be rad cap like gas said.

I once worked on a car doing the same that turned out to be the fuel tank breather was blocked (with a wasp nest :shock: ) and air couldnt get in to replace the fuel as it was used.
The test for that is take of the fuel filler cap and see if the fault goes away.
Given that you changed tanks the breather may have gotten pinched.

thanks guys,

I will try & get it to fault this afternoon but it is alot cooler this afternoon in Vic. I will let you know

Thanks Everyone,

It appears Ol' Fart may have solved the problem. I took the care for a flogging & then let it idle sitting in the driveway for 20mins. I was then able to get the fault to happen. I then removed the the fuel cap (with much hissing). The problem seemed to be clear. I not sure if air was rushing into or out of the tank. I will keep you posted. Thanks again

Hi Guys,

The fuel cap being opened hasn't cleared the fault...any more ideas?

Hi Jim
I'm wondering if it could be due to something causing a blockage in the exhaust system. Disintegrating internals in CAT or muffler maybe? Or something on the inlet side, air filter or inlet assembly. A vac gauge connected to throttle body would give an indication of that sort of problem.
Maybe fuel pressure problem like Ol, Fart mentioned. Would be good to know if it's correct but needs a suitable gauge and the fittings to do that :doubt:

If you are getting too much pressure in the fuel system, the check valve is blocked to the carbon canister, this can cause symptoms similar as the fuel pressureises and also can get a vapour lock.

I reckon it sounds like a sensor problem which is failing when it reaches a certain temprature. AFM or O2 sensor maybe? It's failing when it reaches a certain temp.

Are you able to take the car somewhere that can hook a up a MUT computer to see if any error codes are registered in the ECU. A Mitsubishi dealer should be quite accomodating with this request and shouldn't charge you anything.

Does the 'Check Engine' light pop up on the dash when the problem is happening?

HI Guys,

I will print these out & give it to my mechanic. I drove the car for some time yesterday morning & took it to a local Mitsubishi dealer. They were excellent but unforunately we could not get the fault to occur so they could check it out.

There are no indication lights that come on.

I know very little about cars but to me it sounds electronic which then poses the question why did it start after the work mentioned ealier?

Will not be o2 sensor, will not cause this at all. Most sensors either work or do not being electronic, temp sensor woudl not kill the car either.

I then removed the the fuel cap (with much hissing). The problem seemed to be clear. I not sure if air was rushing into or out of the tank
Mmmm...Sounds a bit odd that there would be hissing from the fuel cap when its removed. Can't say I've ever noticed that on my TR.
Only come across that on a car with a blocked tank breather.Tank started to collapse as fuel was pumped out.Didn't run too well at times :shock:
Can't imagine there would be a normal condition where the tank would have vac or pressure.
Isn't it vented through the canister that Madmagna mentioned.
Not sure if it has been given test run with the fuel cap open.

I have had the problem with the fuel cap removed