Won't start !!!!
Discussion
Gents, can anyone help with this.
Over the last 2 weeks, it has taken a couple attempts to start the car. This is unusual as it normally only need to turn over once before fireing.
But today, after fitting a new exhaust system it struggled to start again. Then 20 mins later I came to start it again and it won't catch. It doesn't even try. The engine turn, but does not fire. The battery is good, but with all my pumping of the throttle, I cannot smell petrol.
Any ideas ? Where's the fuel filter ? Anyone want to come and fix it for me ( only kidding) but any advise/what to try next would be appreciated.
Cheers
Andy
Over the last 2 weeks, it has taken a couple attempts to start the car. This is unusual as it normally only need to turn over once before fireing.
But today, after fitting a new exhaust system it struggled to start again. Then 20 mins later I came to start it again and it won't catch. It doesn't even try. The engine turn, but does not fire. The battery is good, but with all my pumping of the throttle, I cannot smell petrol.
Any ideas ? Where's the fuel filter ? Anyone want to come and fix it for me ( only kidding) but any advise/what to try next would be appreciated.
Cheers
Andy
Are the plugs wet with fuel?
If you have flooded it, then you can try drying out three plugs on one side which are easy to get at. If you struggle again, try drying it out by cranking with your foot in the floor. The system has an anti-flood strategy where if the throttle more than 3/4 at cranking it stops injecting.
Sounds like you need to pop round to have it checked/put the latest map in.
YellowShed
If you have flooded it, then you can try drying out three plugs on one side which are easy to get at. If you struggle again, try drying it out by cranking with your foot in the floor. The system has an anti-flood strategy where if the throttle more than 3/4 at cranking it stops injecting.
Sounds like you need to pop round to have it checked/put the latest map in.
YellowShed
Sounds like you need to pop round to have it checked/put the latest map in.
Yellowshed
Thanks for the advise. I have a GTO3, Do I have a programmable ECU then ? And when you say 'pop around', where is 'around'
I will get the plugs out and check for spark and fuel.
OK that didn't take long. I have checked the plugs and am getting a spark, but no smell of fuel in the cylinders at all.
Could I have a blockage ? I have a quarter of a tank of fuel. Has anybody else had problems with fuel starvation ?
Yellowshed
Thanks for the advise. I have a GTO3, Do I have a programmable ECU then ? And when you say 'pop around', where is 'around'
I will get the plugs out and check for spark and fuel.
OK that didn't take long. I have checked the plugs and am getting a spark, but no smell of fuel in the cylinders at all.
Could I have a blockage ? I have a quarter of a tank of fuel. Has anybody else had problems with fuel starvation ?
Edited by madmacmcmad on Sunday 11th March 16:06
Andy,
We're in Brentwood, Essex. Don't know if that helps.
If you're not getting fuel into the cylinders, but you have got spark, then the ECU is working OK to give you spark, so the fault is somewhere else.
Are you 100% positive you have the fuel pump running when you switch the ignition on?
Do you have pressure in the fuel rail (check the Schrader Valve on the fuel rail under the throttle body - should have a black plastic cap on it)?
YellowShed
We're in Brentwood, Essex. Don't know if that helps.
If you're not getting fuel into the cylinders, but you have got spark, then the ECU is working OK to give you spark, so the fault is somewhere else.
Are you 100% positive you have the fuel pump running when you switch the ignition on?
Do you have pressure in the fuel rail (check the Schrader Valve on the fuel rail under the throttle body - should have a black plastic cap on it)?
YellowShed
OK
I have taken off what I think is the schrader valve (small tap with black cap under the throttle linkages) on main fuel rail and started the ignition. The fuel pump runs, but I only get a pityful dribble.
This to me, points to no fuel or shagged pump or blocked filter. Can someone agree or have I missed something.
I have a new pump to fit, so I'll check the filter then.
Anyone had similar problems ?
I have taken off what I think is the schrader valve (small tap with black cap under the throttle linkages) on main fuel rail and started the ignition. The fuel pump runs, but I only get a pityful dribble.
This to me, points to no fuel or shagged pump or blocked filter. Can someone agree or have I missed something.
I have a new pump to fit, so I'll check the filter then.
Anyone had similar problems ?
Hi Andy,
The fuel pipes are quite big from the tank, take off the cover in front N/S/R wheel and you'll see the pump and filter. The filter is just a paper type inside the canister. See if you have fuel at the filter, be careful though as it will leak heavily, I cable tied mine up higher than the tank level to stop me wearing it all.
HTH
Dave
The fuel pipes are quite big from the tank, take off the cover in front N/S/R wheel and you'll see the pump and filter. The filter is just a paper type inside the canister. See if you have fuel at the filter, be careful though as it will leak heavily, I cable tied mine up higher than the tank level to stop me wearing it all.
HTH
Dave
OK Gents. I still need your help.
I have fitted my new pump and it works fine. When I undo the schrader valve, I get a spray of fuel, so I know it has got as far as the fuel rail, but it still won't start.
It turns over well and I am getting a spark. But when I remove a plug it is dry with no smell of fuel.
So, Is there anything else in line to the injectors ? Inline filter maybe or solenoid etc. What about a second high pressure pump (clutching at straws here)
What would be the process to find my fault ?
Many thanks
Andy 07798 790423
I have fitted my new pump and it works fine. When I undo the schrader valve, I get a spray of fuel, so I know it has got as far as the fuel rail, but it still won't start.
It turns over well and I am getting a spark. But when I remove a plug it is dry with no smell of fuel.
So, Is there anything else in line to the injectors ? Inline filter maybe or solenoid etc. What about a second high pressure pump (clutching at straws here)
What would be the process to find my fault ?
Many thanks
Andy 07798 790423
That suggests the injectors are failing to fire.
Any chance of getting a scope or fast updating multimeter on the injector signal to see if it's firing? Or, if they're anything like jenvey injectors, you could pop one out and see if it's happy to spray fuel everywhere (whilst taking care not to incinerate yourself...).
Could also be a duff throttle pot - if it's thinks you've got your foot down, the ecu might hold off the fuelling on the assumption that you're trying to clear a flooded engine...
Jim
Any chance of getting a scope or fast updating multimeter on the injector signal to see if it's firing? Or, if they're anything like jenvey injectors, you could pop one out and see if it's happy to spray fuel everywhere (whilst taking care not to incinerate yourself...).
Could also be a duff throttle pot - if it's thinks you've got your foot down, the ecu might hold off the fuelling on the assumption that you're trying to clear a flooded engine...
Jim
Jim
The throttle pot sounds more likely as It is not likely to be all the injectors unless the ecu is preventing them doing their job. Is there an easy way to test the throttle pot ?
If not, I am assuming that it is a ford standard pot.
Also, if I change the pot, will I have to have it reset ?
The throttle pot sounds more likely as It is not likely to be all the injectors unless the ecu is preventing them doing their job. Is there an easy way to test the throttle pot ?
If not, I am assuming that it is a ford standard pot.
Also, if I change the pot, will I have to have it reset ?
madmacmcmad said:
Jim
The throttle pot sounds more likely as It is not likely to be all the injectors unless the ecu is preventing them doing their job. Is there an easy way to test the throttle pot ?
The throttle pot sounds more likely as It is not likely to be all the injectors unless the ecu is preventing them doing their job. Is there an easy way to test the throttle pot ?
Slim chance it could be a burnt out injector driver in the ecu I suppose...
madmacmcmad said:
If not, I am assuming that it is a ford standard pot.
Also, if I change the pot, will I have to have it reset ?
Connecting a laptop to the ecu loom would be easiest, if you have access to the MBE cable & s/w (er, and an MBE ecu...). Or a multimeter on the pot if you can get to it - I guess you'd be looking for the voltage on one side varying across the full range of pedal movement.
A new pot would almost certainly have to be carefully fettled to match what the ecu is expecting to see at the extremes of input.
Jim
JimNoble said:
A new pot would almost certainly have to be carefully fettled to match what the ecu is expecting to see at the extremes of input.
Jim
When Trevor replaced mine it was just a simple start up process. Jim
Having had a dodgy throttle pot, it didn't stop it starting, just massivly lumpy on idle.
J
OK, I've done more investigating. Contrary to previous posts, I now have a good flow of fuel at the rail. When I take off the schrader valve and run the pump, I get 2 foot of fuel.
But still won't play ball.
Is there an air bleed at the end of the rail ? What stops trapped air ?
I have a spark and fuel at the rail, so the injectors are not pulsing.
I will speak to Noble tomorrow, but apart from the throttle pot, is there anything else that may prevent the injectors doing their job ?
Getting worried that I may have a shagged ECU now.
What about the imobiliser ? Would that prevent the injectors doing their job if not reset properly ? (clutching at straws)
But still won't play ball.
Is there an air bleed at the end of the rail ? What stops trapped air ?
I have a spark and fuel at the rail, so the injectors are not pulsing.
I will speak to Noble tomorrow, but apart from the throttle pot, is there anything else that may prevent the injectors doing their job ?
Getting worried that I may have a shagged ECU now.
What about the imobiliser ? Would that prevent the injectors doing their job if not reset properly ? (clutching at straws)
Edited by madmacmcmad on Wednesday 14th March 21:17
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