Looking for your thoughts....

T

ttt0000

Member
Messages
117
Hi,
If you have any experience or knowledge and have a few minutes to spare, please have a read below?
4200 CC 2003
Car and engine very well looked after in previous home.
Car ran out of petrol and was left sat for 6 months in between last owner and us.
Starts instantly and sounds great and then as the revs increase, the misfiring starts.
Mis-firing Error codes are P0300, P0301, P0302, P0303
New spark plugs, same error codes.
Coils checked and swapped to opposite bank, same error codes
Faulty O2 sensor replaced, same error codes
Same 'pressure' from both exhausts (Non standard exhausts with no pre cats)
MAF lead connector cleaned and slightly better but still misfiring, same error codes.
The next steps are fuel rails and smoke test.
Is there anything else we should be thinking about?
Thanks
 
CatmanV2

CatmanV2

Member
Messages
48,796
No doubt someone will have a better idea, but I reckon you've got a problem with the fuel pump feeding bank one. Blocked with crud perhaps

C
 
2b1ask1

2b1ask1

Special case
Messages
20,275
Hi, I'll let others step in with advice as I don't want to cloud their responses :)

Hope you sort it quickly we want to see this one up and running soon...
 
T

ttt0000

Member
Messages
117
She arrived back this afternoon with a new clutch and service and Mr T had his first drive this evening:)
Learning loads about Masser engines and it is just a case of time and investigation now
We will get there :)
 
Contigo

Contigo

Sponsor
Messages
18,376
Disconnect the MAF and run open loop. Any better? What happens?
Fill the tank with Optimax and take it for a long run.
Change the fuel filter (this is a must!!!!!) Any better?
Check fuel pressure at the rails.
When you say no pre-cats? There must be some cats? Only secondary or race cats? If it is shutting down one bank there is every chance it could be Cat related.
 
T

ttt0000

Member
Messages
117
Disconnect the MAF and run open loop. Any better? What happens? - Disconnected the MAF and didnt seem to make any difference. (Same codes showed afterwards as well)
Fill the tank with Optimax and take it for a long run. - runs fine slowly but as you increase the load, the misfiring gets worse so dont want to risk a longer journey yet?
Change the fuel filter (this is a must!!!!!) Any better? - I didnt think the 4200s had fuel filters. Will def look at this
Check fuel pressure at the rails - next job to do
When you say no pre-cats? There must be some cats? Only secondary or race cats? - I have no idea, the specialists checked the whole car as part of the service and said no pre cats.
If it is shutting down one bank there is every chance it could be Cat related. - The specialists also suggested this but the previous owner hasnt had any problems in the last 5 years, the misfire only started after it had run out of fuel so we looking at the 'fuel run dry' options first. We were thinking of swapping the non-standard exhausts back to standards to see if that made any difference?
Thanks P, appreciate your thoughts and will work through them as well
 
T

ttt0000

Member
Messages
117
Oxytorch/Contigo, thanks both. Fuel pressure good at both rails.
So far:
Car and engine very well looked after in previous home.
Car ran out of petrol and was left sat for 6 months in between last owner and us.
Starts instantly and sounds great and then as the revs increase, the misfiring starts.
Mis-firing Error codes are P0300, P0301, P0302, P0303
New spark plugs, same error codes.
Coils checked and swapped to opposite bank, same error codes
Faulty O2 sensor replaced, same error codes
Same 'pressure' from both exhausts (Non standard exhausts with no pre cats)
MAF lead connector cleaned and slightly better but still misfiring, same error codes
Latest:
Injectors swapped, no difference
MAF unplugged, no difference
Exhaust tester on order and will hopefully have an answer of the Cats by the end of the week.
If anyone has any more ideas, please feel free to contribute
Thanks
 
rockits

rockits

Member
Messages
9,172
Surely being out of fuel is a bit too coincidental for it to be anything other than a bit of crud in the system picked up and run through. Bit of dirty fuel blocked/blocking something somewhere.
 
rockits

rockits

Member
Messages
9,172
Had it in our oil fed boiler after we run out of oil. Ran through a load of oil to clear out crud & worked fine after than. Also had some air in the system that needed bleeding out.

Can you get any air in car fuel systems when it runs out of fuel?
 
2b1ask1

2b1ask1

Special case
Messages
20,275
I don't know how many miles were put on it after it was taken, I recal it was 73280 ish we have no idea what fuel they put in it only that they put some in as they felt the need to jemmy the cap off rather than Google where the release button was. The fuel could well have been stolen too.

I really think the issue is entirely fuel related, god forbid they put anything untoward in the tank but it has to be considered now. I'm sure your diligent diagnostics will get there soon. If you can disconnect the rails and let the pipes flood out any junk in the pipes will get flushed. Have you brimmed the tank with a premium super grade fuel?

As long as the exhaust pipes have not been crushed from its travels around the salvage yard I guarentee it will not be pipes or cats as they never gave any issues but a lot of joy.

Hang in there.
 
T

ttt0000

Member
Messages
117
Thanks all.
Forgot to add, bought a new fuel pressure guage which showed pressure was 42 at both rails so not fuel pressure related.
Run for 30 mins at idle after battery reset after topping up with SUL
Runs beautifully at start up and for a few minutes at idle but when she gets hot, she starts to misfire. (Whether increased load on pedal or idling for more than 20 mins). Exhaust emissions tester bought and on its way.
Getting her up on the ramp this week so that will be easier to investigate underneath.
Will keep you informed.
 
voicey

voicey

Member
Messages
660
If the tank was allowed to run dry then one or both of the pumps is likely to be goosed. My first step would be to measure the fuel pressure at the rail on each side.
 
allandwf

allandwf

Member
Messages
10,995
ttt0000 said:
Thanks all.
Forgot to add, bought a new fuel pressure guage which showed pressure was 42 at both rails so not fuel pressure related.
Run for 30 mins at idle after battery reset after topping up with SUL
Runs beautifully at start up and for a few minutes at idle but when she gets hot, she starts to misfire. (Whether increased load on pedal or idling for more than 20 mins). Exhaust emissions tester bought and on its way.
Getting her up on the ramp this week so that will be easier to investigate underneath.
Will keep you informed.
Click to expand...
Not quite as easy, it may be flow related.
 
T

ttt0000

Member
Messages
117
voicey said:
If the tank was allowed to run dry then one or both of the pumps is likely to be goosed. My first step would be to measure the fuel pressure at the rail on each side.
Click to expand...

Thanks V, fuel pressure was 42 at both rails so we think fuel pressure is okay?
 
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