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Author: Subject: Car won't start
Greenie

posted on 22/6/22 at 07:32 PM Reply With Quote
Car won't start

Hi all looking for help.

I own a SSC Stylus which runs a C20XE built by SBD Motorsport. It's running throttle bodies and MBE 956.

On Saturday I went out for a nice little run out, and it ran great. Parked upon return and left for a few hours before starting it and reversing it into the garage. Started no problem at all.

On Sunday I went to get it out and it wouldn't start, turned over but no fire. I have tested the spark at each lead and all seems good, it's getting plenty fuel, checked all connections etc. Changed the cool pack with a spare which came with the car.

It just ain't having it totally stumped.

How can it be great one day and not the next.

Really would appreciate any help and advice.

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Oddified

posted on 22/6/22 at 08:29 PM Reply With Quote
If you haven't already, get easimap on a pc connected to the ecu, check everything is showing sensible readings/values such as air/coolant temperatures, and throttle position (closed/idle should be site 0.0). When cranking, rpm would normally be around 150 - 200 rpm.

The 956 is a fairly simple ecu, not many inputs/outputs so there's not much to go wrong.

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Mr Whippy

posted on 22/6/22 at 11:08 PM Reply With Quote
Well if you've checked and there is a strong spark at the plugs and not even one cylinder is firing, then it must be the fuel.

What happens if you squirt some petrol into the throttle bodies...does it try to fire?

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Greenie

posted on 23/6/22 at 06:33 AM Reply With Quote
Thanks for the prompt reply.

Not easy to download the version of easimap4, need a prehistoric laptop which will take pre windows 2000.

There is loads of fuel getting in, but maybe edging towards contaminated fuel, banged a couple of gallon in on the day before it stopped working.?

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nick205

posted on 23/6/22 at 09:21 AM Reply With Quote
quote:
Originally posted by Mr Whippy
Well if you've checked and there is a strong spark at the plugs and not even one cylinder is firing, then it must be the fuel.

What happens if you squirt some petrol into the throttle bodies...does it try to fire?



That'd be my first line of attack - if you have a can of "Easy Start" a spray of that in the intake when cranking normally gets it going (if only briefly). That would help identify if it's a fuel issue.

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adithorp

posted on 23/6/22 at 10:30 AM Reply With Quote
When you say "loads of fuel" do you mean at the fuel rail or are the plugs wet? If the plugs are dry then check the injectors aren't firing.





"A witty saying proves nothing" Voltaire

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Mr Whippy

posted on 23/6/22 at 11:56 AM Reply With Quote
quote:
Originally posted by adithorp
When you say "loads of fuel" do you mean at the fuel rail or are the plugs wet? If the plugs are dry then check the injectors aren't firing.


ditto it's something very straightforward

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BenB

posted on 23/6/22 at 12:22 PM Reply With Quote
quote:
Originally posted by nick205
quote:
Originally posted by Mr Whippy
Well if you've checked and there is a strong spark at the plugs and not even one cylinder is firing, then it must be the fuel.

What happens if you squirt some petrol into the throttle bodies...does it try to fire?



That'd be my first line of attack - if you have a can of "Easy Start" a spray of that in the intake when cranking normally gets it going (if only briefly). That would help identify if it's a fuel issue.


That was my thinking. Blowtorch the plugs if they look flooded to dry them out and then crank it and ASAP squirt some of that stuff in. That should get it to make some noise before the plugs flood!!!
Another thing would be to use an inline ignition tester to check that the plugs are truly sparking when under compression. It's unlikely all the plugs would stop sparking but a poor spark from the driver/coil could result in a situation in which the plugs will spark when out of the cylinder but fail to spark when under compression.

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Greenie

posted on 23/6/22 at 05:46 PM Reply With Quote
It's getting plenty of fuel into the cylinders.

Really beleive it's bad fuel.... going drain it off at the weekend.

I will keep you all updated.

I am in a fortunate position that I work in the parts industry. Do parts are on sale or return.

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Mr Whippy

posted on 23/6/22 at 09:21 PM Reply With Quote
quote:
Originally posted by Greenie
It's getting plenty of fuel into the cylinders.

Really beleive it's bad fuel.... going drain it off at the weekend.

I will keep you all updated.

I am in a fortunate position that I work in the parts industry. Do parts are on sale or return.



Diesel

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Greenie

posted on 25/6/22 at 02:23 PM Reply With Quote
Quick update

He car has a low pressure fuel pump from the tank to a swirl pot then a high pressure to the fuel rail, so I thought I would use the low pressure pump as a method of taking the fuel from the tank, took the feed off at the swirl pot and it just trickles then gives up, but the pump is still ticking as normal.... low pressure facet pump goosed???

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adithorp

posted on 25/6/22 at 02:28 PM Reply With Quote
Or filter/pipe/intake blocked. Facets usually don't tick when they've failed.

Confused how it had "loads of fuel" if this is the case.





"A witty saying proves nothing" Voltaire

http://jpsc.org.uk/forum/

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Greenie

posted on 25/6/22 at 02:35 PM Reply With Quote
Exactly ..... this has got me stumped .
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Mr Whippy

posted on 25/6/22 at 03:36 PM Reply With Quote
probably just full of crap, time to strip it down but at least you've found the fault.
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rusty nuts

posted on 25/6/22 at 08:21 PM Reply With Quote
Screw in filter blocked, had the same problem with my facet
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pigeondave

posted on 26/6/22 at 08:57 AM Reply With Quote
Sounds like a quick blast with an air line back up the pipe.

No airline? Use an electric tyre inflator with the lilo attachment. Fuel will go everywhere a d you will melt the tarmac.

Could it be that the fuel tank. Is rotting from the inside?

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SJ

posted on 30/6/22 at 08:56 AM Reply With Quote
Mine did something similar and it was gummed up fuel in the fuel filter after the tank. New filter and it was sorted.
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Greenie

posted on 30/6/22 at 06:09 PM Reply With Quote
Working my way through the fuel system, which as you can imagine ain't a pleasurable job, but as I do I now find that the high pressure fuel pump and filter are cable tied together under the inner wing to a broken clamp.... need to dig deeper is to see what other outrageous issues I find.
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