Temperature related problem - it is probably not..

oport

oport

Member
Hello fellow Rover drivers,

I drove my 3500 for the first time on the autobahn today. It was the first time the car had to run over 100 km/h for an extended time and guess what: Something goes wrong....
After a while (ca. 20 Minutes) running fine the engine startet to stutter as if it doesnt get enough fuel. There are no misfirings, just no more power when using the throttle. Ok, i stopped and let the engine idle for about two minutes, checked under the hood. I could not find anything suspicious, so i started the car again. Everythign was fine again. But after approx. 40 km the same story again. The funny thing is, that when the stuttering happens, i does not help just to slow down, the stuttering persists. But when you stop the car and turn the engine off for a minute or let it idle, than everything goes back to normal. Temp. gauge is on the left side of green (perhaps a faulty thermostat), the engine is running perfectly otherwise. Can you give me any hints what goes wrong? I can drive the car with full power over a shorter period of time without problem, but after running for a longer time the stuttering occurs. Overheated fuel which produces bubbles in the fuel line? How would you try to fix this?
I need a cure, because i sold the Rover to my wife as the ultimate autobahn tool, and on the first longer run we keep having this problem. Almost got late to the family meeting today...

CU Olaf
 
Re: Temperature related problem

Could be fuel shortage, try pulling the reserve knob see if that makes a difference this would indicate a blocked pipe.

Get a service kit for the fuel pump or upgrade to an electric pump. Although if the tank is full the fuel is so high that the pump doesn't do that much - how full was your tank when the problem happend ?

The other alternative is coil and condenser, it is worth have spares anyway so get new and swap these over - Easy to do so I would start with these and these do fail when hot and under load / higher revs
 
Re: Temperature related problem

Hi John,

i suspected the same about the tank and stopped at a petrol station and filled up - no change of behaviour, still started stuttering after a while. The ignition was changed to a pertronix three weeks ago, that should not be the reason for the problem. Fuel pump is already an electric pump. The funny thing is that everything works fine when driving for shorter periods of time....

CU Olaf
 
Re: Temperature related problem

Hello,

after some more thinking and a discussion with another P6 driver i think my first guess was wrong. It seems to be that the problem is not temperature related. The reason for the stuttering is not enough fuel in the floating chambers, either due to a blockage in the fuel filter or the fuel pump. There is enough fuel for lower power situations, but when more fuel over an extended period of time is needed, the float chambers run dry. Seems logical to me, so my first try will be to check filter and pump for blockages and give it some air pressure to clean.

CU Olaf
 
Hello folks,

unfortunately i have to bring this thread back to life. I checked the petrol pump for any debris blocking the fuel lines. No result, absolutely clean. The fuel filter ist clean as well. It seems that my blocking theory just went out of the window...
I ordered a set of magnecor leads at RPI, since a couple of people said that the leads often cause a failure as described when old. After driving for a while i opened the fuel tank and checked if there was any sign of a vaccum indicating a blocked tankventilation, but no signs of escaping air.

I am scratching my head right now...

Any more hints what to do next?

CU Olaf
 
Where is the electric fuel pump and how long has it been on there?

Also, are you running a fuel pressure regulator, and if so what pressure have you got it set at on tickover?

Richard
 
Hi Richard,

the fuel pump was the first thing we changed when i got the car 3 months ago. Replaced the faulty mechanical pump. It is a pump which is able to deliver 75 liters/minute which should be more than enough. I have no fuel pressure regulator installed. This setup is running with exactly the same pump without problems in a couple of other cars. I don´t think the pump itself is faulty, since it is delivering enough fuel even when accelerating very hard and running on the autobahn for shorter periods of time.

CU Olaf
 
Hello Olaf,

Even though your newly installed Pertronix has only been there for a few weeks, that unfortunately is no guarantee that it is not the culprit. It would be advisable to have it checked regardless.

Ron.
 
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