TVR S Series Barn Find. No fuel pump or injectors
Discussion
phillpot said:
Spacecowboyuk said:
I've checked the yellow plug. It does show some signs of overheating and the white wires are a little 'dark' but everything else seems to work- indicators, hazards, lights, wipers, door glass up and down etc which I understand wouldn't if the connector had had it? I have power at the fuse board.
If it's burnt out you will lose all ignition fed circuits, should be good if you have wipers and indicators.Hazards, windows and sidelights are constant live.
All fuses okay?
I would try putting a live to the injection relay coil or shorting the switching contacts?
Is the Diode okay, not open circuit or round the wrong way?
Edited by phillpot on Sunday 11th February 19:10
Edited by Spacecowboyuk on Wednesday 14th February 18:09
Loosen off the pipe to an injector does it leak fuel? You say the pump operates but does fuel exit the output side of the pump? Does the car have a breathable fuel cap and someone has fitted a non breathable one? This would cause a vacuum in the tank and the pump might not pas fuel.
Can’t think of anything more to try just now, still thinking!
Can’t think of anything more to try just now, still thinking!
Nothing to add really, but you have a good spark? Just no fuel pump priming or injection on the ignition?
Is it a bad idea to get someone to crank the engine while you power the fuel pump externally? That would at least tell you (if it fires) that it's electrical or mechanical. I suggest you can pull the power to the pump quickly if needed!!
Is it a bad idea to get someone to crank the engine while you power the fuel pump externally? That would at least tell you (if it fires) that it's electrical or mechanical. I suggest you can pull the power to the pump quickly if needed!!
Interestingly I have power probed the ground going into the brown relay which has been poorly soldered before and it shows a feint green on the probe. So I put it to second ignition and probed it and it showed a positive to the ground? Is that normal?
Anyway I thought I'd risk it and shot a ground on the powerprobe into it and I got nice clicking injectors and the fuel pump energised for 5 seconds!
So does this mean I have a dodgy ground to that brown relay? If I ran a fresh one from the battery would that be OK? Should I be worried I get a positive on the brown when set at second ignition?
Anyway I thought I'd risk it and shot a ground on the powerprobe into it and I got nice clicking injectors and the fuel pump energised for 5 seconds!
So does this mean I have a dodgy ground to that brown relay? If I ran a fresh one from the battery would that be OK? Should I be worried I get a positive on the brown when set at second ignition?
Mercdriver said:
Loosen off the pipe to an injector does it leak fuel?
there's only a single feed pipe to the fuel rail but on that rail is a valve, like a tyre valve, with ignition on the pump should run for a couple of seconds and you should have fuel squirt out if you depress the valve core with a little screwdriver or similar.Mercdriver said:
Loosen off the pipe to an injector does it leak fuel? You say the pump operates but does fuel exit the output side of the pump? Does the car have a breathable fuel cap and someone has fitted a non breathable one? This would cause a vacuum in the tank and the pump might not pas fuel.
Can’t think of anything more to try just now, still thinking!
I get plenty of fuel up at the injectors which is good news 👍🏼 Can’t think of anything more to try just now, still thinking!
In your first post you said you had sparks, so if you now have pumping fuel the only other thing you need is air.
Have you checked there's no obstruction, eg blocked air filters, blocked pipes? If the car had been sitting in a barn you could have a rodent nest in the intake system.
If you have fuel, air and sparks then check the timing and the HT leads are in the correct firing order.
Have you checked there's no obstruction, eg blocked air filters, blocked pipes? If the car had been sitting in a barn you could have a rodent nest in the intake system.
If you have fuel, air and sparks then check the timing and the HT leads are in the correct firing order.
Barn find? Old fuel goes gummy, you say you have fuel at the injector but if you take the injector out does it spray fuel, do they all spray fuel.?
You say you have fuel, spark and timing is OK so it should run even if very badly
Re brown wire, I think in that age of car brown is earth, look on the relay to see the moulded PIN number if you have a CD you can check if this is an earth wire
You say you have fuel, spark and timing is OK so it should run even if very badly
Re brown wire, I think in that age of car brown is earth, look on the relay to see the moulded PIN number if you have a CD you can check if this is an earth wire
It's definitely an earth. On my spare loom, if I follow it back it splits off to a thicker brown (presumably still earth) which then goes to the ecu pin 20 and the shielding grounds that are wound on the outside of the dissy module wires. The other split-off then turns into a black wire which goes into the loom connector plug.
The diagram then says the other side of the connector should be a white wire but mine is black coming out of there which then goes through the wing into the engine bay.
Anyone know where all the grounds are located in the engine bay?
The diagram then says the other side of the connector should be a white wire but mine is black coming out of there which then goes through the wing into the engine bay.
Anyone know where all the grounds are located in the engine bay?
Edited by Spacecowboyuk on Wednesday 14th February 18:09
Short lived excitement.
I connected a temporary ground from a spade terminal under the dash which has a strong ground to the brown wire on the injector relay. I now get both injector and fuel pump relay energising.
I depressed the schrader valve and I have yellow fuel spurting out momentarily after the pump has energises for 5 seconds. I then, probably foolishly, put 5 litres of fresh fuel down the tank and test fired her. Doesn't want to run.
Took out the spark plugs and I wouldn't say they are particularly wet so I wonder if I have gummed up my injectors or if they are just not firing.
If anyone can advise how to remove an injector to test it I'd appreciate it. They look well hidden under that intake...
I connected a temporary ground from a spade terminal under the dash which has a strong ground to the brown wire on the injector relay. I now get both injector and fuel pump relay energising.
I depressed the schrader valve and I have yellow fuel spurting out momentarily after the pump has energises for 5 seconds. I then, probably foolishly, put 5 litres of fresh fuel down the tank and test fired her. Doesn't want to run.
Took out the spark plugs and I wouldn't say they are particularly wet so I wonder if I have gummed up my injectors or if they are just not firing.
If anyone can advise how to remove an injector to test it I'd appreciate it. They look well hidden under that intake...
Good news! I managed to get her running today.
She needed a good deal of cranking over then cleaning fould up plugs then cranking again. With the help of jump leads to my A4 it provided enough resilience in the battery to give her the cranking power she needed and eventually sprang to life. She's running rough as you'd expect but she does run and sounds great considering.
Thanks to everyone for their suggestions. Now all I need to do is sort the coolant which is dry, brakes and clutch....
Is there an easy coolant drain plug on these or is it just bottom hose off? I'll consult the Steve Heath book as well when back home.
She needed a good deal of cranking over then cleaning fould up plugs then cranking again. With the help of jump leads to my A4 it provided enough resilience in the battery to give her the cranking power she needed and eventually sprang to life. She's running rough as you'd expect but she does run and sounds great considering.
Thanks to everyone for their suggestions. Now all I need to do is sort the coolant which is dry, brakes and clutch....
Is there an easy coolant drain plug on these or is it just bottom hose off? I'll consult the Steve Heath book as well when back home.
Congratulations & well done for persevering.
Si it's bottom hose off and sopping wet sleeve I'm afraid.
Spacecowboyuk said:
...Is there an easy coolant drain plug on these or is it just bottom hose off? I'll consult the Steve Heath book as well when back home.
From memory, the answer is no. The rad is upside to it's OEM fitting so the drain valve becomes an air bleed screw on a TVR Si it's bottom hose off and sopping wet sleeve I'm afraid.
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