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engine problem update
tri - 30/1/06 at 08:24 PM

hey thanks to all the help i have got over last few weeks I have managed to get the car to run as long as it is kept under 3000 before it cuts out like it used to do at when we started to move off
Anyone got any ideas as to what could be causeing it?

Tri

[Edited on 30/1/06 by tri]

Oliver Coles - 30/1/06 at 08:32 PM

Does your engine use fuel injection or carbs?

tri - 30/1/06 at 08:36 PM

sorry forgot to say that it is a carb which was just replaced

Tri

[Edited on 30/1/06 by tri]

gary gsx - 30/1/06 at 09:40 PM

What ignition set up are you running

tri - 30/1/06 at 11:02 PM

my dad told me its Bosch distributer (breakerless) with switch/amp module.
if thats any help

Chippy - 30/1/06 at 11:12 PM

Have you checked the valve timing? I assume the engine is a Pinto, and if you get the cam belt just a notch out it will run, but it wont pull.

tri - 30/1/06 at 11:43 PM

we thought that but now we have it pulling but after 3000 it just kills itself thats whats got use reather stumped
Tri

scutter - 30/1/06 at 11:45 PM

I had this problem, but at 4500rpm. Turned out to be a flattened fuel pipe was causing restricted flow above that rpm, might be worth a look.

ATB Dan.

tri - 31/1/06 at 12:00 AM

was it kinked or just close to being

Tri

scutter - 31/1/06 at 12:08 AM

It was flattened almost halfing it's cross section, this was a steel braided hose aswell.

ATB Dan.

JonBowden - 31/1/06 at 09:17 AM

5 minutes on a rolling road would find the problem - this would be cheaper than replacing bits to find the problem

britishtrident - 31/1/06 at 01:02 PM

Is the engine fading at 3000 rpm out of gear or just when under load ?

To explain a bit:
With fuel delivery problems on carb engines what happens is the engine runs fine at low load & rpm. But put it under load and the engine burns fuel faster than its is delivered to the float chamber. As a result the fuel level in the chamber fall untill it gets to a point where the main jets are no longer covered and the engine looses power.
Typically at this point if you back off the throttle and let the car coast for a hundred yards the float chamber will fill up again and regain full power for a few hundred yards.

However if the engine dosen't regain power it points to a blocked main jet or ignition or valve fault.

britishtrident - 31/1/06 at 01:03 PM

quote:
Originally posted by JonBowden
5 minutes on a rolling road would find the problem - this would be cheaper than replacing bits to find the problem


It just really requires basic mechanics fault finding ie: applying logic rather than replacing bits at random.

gary gsx - 31/1/06 at 01:24 PM

Has it got one of them silly rotor arms with the rev limiter on it????

tri - 31/1/06 at 01:37 PM

quote:
Originally posted by britishtrident
Is the engine fading at 3000 rpm out of gear or just when under load ?

To explain a bit:
With fuel delivery problems on carb engines what happens is the engine runs fine at low load & rpm. But put it under load and the engine burns fuel faster than its is delivered to the float chamber. As a result the fuel level in the chamber fall untill it gets to a point where the main jets are no longer covered and the engine looses power.
Typically at this point if you back off the throttle and let the car coast for a hundred yards the float chamber will fill up again and regain full power for a few hundred yards.

However if the engine dosen't regain power it points to a blocked main jet or ignition or valve fault.



thats is alot like what is happening what can i do to fix it is it is this ?????

Tri

gary gsx - 31/1/06 at 06:39 PM

Has the fuel tank got a breather

tri - 31/1/06 at 06:58 PM

Yeah and it used to work but then left it a few months then it devloped this problem


Tri

britishtrident - 31/1/06 at 07:18 PM

Take the petrol ap off, disconnect the fuel line at the pump inlet and blow the fuel line back to the tank with a couple of squirts of a fuel pump.
Then reconnect the pipe from the tank to pump.
Then disconnect the fuel pipe from the pump to carb, blow it back from the carb end the same way.
Reconnect the pump end direct the carb end of the pipe into a glass jar. Disconnect the coil wire (for obvious fire prevention reasons) and turn the engine over a few times to see how much fuel is actually being pumped.

If you have an electric pump obviously you just ned to turn the ignition rather than turn the engine over.

[Edited on 31/1/06 by britishtrident]

C10CoryM - 31/1/06 at 07:23 PM

When it dies does it shut off like someone shut the switch off or does it stumble then die?
When it dies, what happens when you try to restart? Does it crank for a while or start right away? Any black smoke? You have to hold pedal to floor to get it started?

tri - 31/1/06 at 08:03 PM

It stubles then dies but it wont die if u leave it when its stumbling like described by someone in earlier reply (forgoten name sorry)
To restart it you just need to turn the key as if it was to start it after leaving it parked with no problems

Tri

C10CoryM - 31/1/06 at 08:23 PM

Doesn't really sound like a fuel issue then. When an engine dies from lack of fuel the floatbowl is empty and needs to refill before the engine will fire. If its too much fuel you have to clear flood it.
Check fuel pressure and volume anyhow as well as your float height.
If you have a timing light hook it up and see what your timing is at higher rpms. If it jumps or drops timing drastically at a certain rpm it can kill the car. Usually will backfire though.