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Topic: EricR are you out there? (Read 446 times) |
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Frank
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EricR are you out there?
« on: Oct 16th, 2006, 6:48pm » |
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I have asked for EricR to comment as he is probably the most informed person on the Forum............however if anyone else knows the cure.............problem is over-fuelling...........car runs OK when cold but when warm the injectors just flood the engine...you can smell petrol in the cabin and it throws it out of the exhaust........no fault codes thrown up TPS and PCM OK and injector wiring replaced rotten anyway.........so Eric if you could make a few suggections I would be most grateful.
Best regards Frank
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: EricR are you out there?
« Reply #1 on: Oct 17th, 2006, 12:42am » |
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What's the matter Frank......you not like the guessing game? 
Hmmmm....fuel rail pressure regulator?.....just a guess 
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twinturbo
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24V's Me game!
Posts: 904
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Re: EricR are you out there?
« Reply #2 on: Oct 17th, 2006, 9:27am » |
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ECT.
TT
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Frank
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Re: EricR are you out there?
« Reply #3 on: Oct 17th, 2006, 7:08pm » |
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Thanks Guys..............points taken but if fuel rail pressure regulator why does it only occur when the engine is warm?
Could it be the H2OS sensors not working?
Again any help appreciated
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twinturbo
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24V's Me game!
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Re: EricR are you out there?
« Reply #4 on: Oct 17th, 2006, 7:19pm » |
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ECT..
If it only hapens when the engine is warm and you have not checked the ECT then start there..
TT
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Eric_R
Administrator
Cosworth Owner 1998 - 2006 & site co-founder
Posts: 1792
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Re: EricR are you out there?
« Reply #5 on: Oct 17th, 2006, 10:06pm » |
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Frank,
oh dear, this is very alarming. The first thing to mention is that this must be sorted quickly, because irreversible damage to the Catalyst(s) will be caused by flooding them with petrol.
Which engine do you have? Is it the 24V or a DOHC?
My first instinct is that this would most likely be caused by the Fuel Rail Pressure Regulator sticking when it gets hot. While the ECT and the IAT have some influence on fuelling, the result is a prolonging of the injection pulse by only milliseconds - not the wholesale flooding that you are experiencing.
Neither will checking the HO2S sensors be much help at this stage. This amount of flooding will likely flatline the sensors in any case - while the LTFTs will be fully depressed into negative figures trying to lean the mixture off. If the HO2S sensors were completely dead then the engine would be in Open Loop and would be running quite happily without flooding like this.
The fuel pump is very powerful, and if as I suspect the FRPR is sticking, fuel pressure in the rail is quite capable of forcing through the injector valves leading to the flooding you mention.
If the engine runs okay while cold it would seem to indicate that the INJectors are working okay and are rewired correctly, and the intake needs a rich mixture when cold anyway. A single stuck INJector would not produce this much flooding and running would be poor, because the system detects the unburnt petrol in the exhaust and leans off the mixture so much that idle suffers.
I would bite the bullet and renew the FRPR. It's about £40 from FMD and a lot less than replacing ruined catalyst(s).
HTH
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After a Cosworth, anything else is just ... ordinary
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howiedintheplace
Senior Member
Based near Evesham
Posts: 1194
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Re: EricR are you out there?
« Reply #6 on: Oct 18th, 2006, 12:58am » |
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Well my first thought would be the fuel reg.
There is a tyre looking valve on one of the fuel pipes, it's a easy job to check the rail pressure with a gauge. I would check that first as the reg. can be a pig to change.
I forgot to add monitor it for 10 minutes while the engine is running.
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Dave
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twinturbo
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24V's Me game!
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Re: EricR are you out there?
« Reply #7 on: Oct 18th, 2006, 8:05am » |
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Quote:| it's a very easy job is to check the rail pressure with a gauge |
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Where do you conenct the Gauge Dave? I need to do this too.....
TT
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howiedintheplace
Senior Member
Based near Evesham
Posts: 1194
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Re: EricR are you out there?
« Reply #8 on: Oct 18th, 2006, 9:09am » |
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Follow the 2 fuel pipes that come/go to the engine.
It's close to the aircon pump, you will see it.
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Dave
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: EricR are you out there?
« Reply #9 on: Oct 18th, 2006, 9:36am » |
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I had a problem with pinking, until I replaced the fuel reg with a brand new Ford one.
Pinking went away, but I then had a problem with starting the car when hot. Eventually I got a fault code up saying that it was running lean 
Suspecting the new regulator, I took it off & was able to blow through it quite easily (so obviously not holding pressure).
I have now purchased another one from FMD (which I couldn't blow through), & all is well again.
Ford have the old (new) regulator, & I am waiting for them to test it so I can get a refund.
It just goes to show you that even purchasing a brand new, original part....doesn't mean it's guaranteed to work properly 
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Frank
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Re: EricR are you out there?
« Reply #10 on: Oct 19th, 2006, 8:25pm » |
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Thanks Eric and everybody else for your responses...............quite frankly I was getting to the point of dumping the car.............and its only done 125k.............will let you know when cured.
Thanks again best regards Frank
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