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[YZ250]

Car runs as sweet as a nut (2003 3.2 Elite Auto) and shows no codes. 50,000 miles on clock.

A couple of days ago I replaced the cam cover seals/spark plugs/fuel filter/crank ventilator box and HBV (irrelevent really). All genuine parts.
Prior to this the car flew, I know the speeds below are normal but it got there pretty rapid.
50mph in first gear, 85mph in second, 128mph in third gear and in the right conditions it would see 150mph on the clock and did not need that much road to get there. (I have a very long driveway)
After changing the above parts (the spark plugs/fuel filter being the only things to affect anything) the car now seems so flat top end power wise. It seems to run out of puff around 125mph whereas before it would fly up to 130-135mph almost anywhere..
I have checked to see if I forgot to re-connect any vacuum pipes but can't see anything amiss. Idle is rock steady, power is smooth and driven normally you would not notice anything was wrong. the kickdown still pulls hard low down, it is just top end.
As said, there are no codes showing and it runs perfect apart from this but I want my missile back. I've been driving like Miss Daisy for months now but I like to know the power is there. :-/ :-/
All replaced parts were genuine parts.

Has anyone come across this before as I have obviously missed something.

TIA
Regards
Alan

[same #same#]

sounds like the engine is thrashed,,,

[Boditza]

maybe you used some bad sparkplugs.. or a bad fuel filter.. or your sparkplugs wiring may be old and by touching it you made it leak electricity

[YZ250]

sounds like the engine is thrashed,,,

I don't drive like this all of the time, in fact very very rarely but I like to know it can do it and anyway the issue come about after 'maintenance' and not gradually. :-/

The reference to speed was merely to show that the car is not on par and that I have done something to upset things upon re-assembly.

[Marks DTM Calib]

Key thoughts:

Fuel filter - Genuine?.....fitted the correct way round?

Vac hoses - Connected up correctly, aprticularly the one at the rear of the plenum?

Fault codes - any present?...pedal test.

Air leaks - Is the brake servo pipe connected up and secure?

And will others please avoid any comments relating to legal speeds etc as there is a problem here to diagnose so lets focus on that.

[YZ250]

Thanks for reply.
Drove the car to work at steady speed and you would never know anything was wrong. Gunned it in sport mode from sliproad onto bypass, pulled like a train in second, into third in the eighties as normal but starting to rapidly fade into treble figures. Car is smooth, no hesitation on kickdown, it just goes flat at the upper end. Idle is good, not lumpy. I agree that as it was a flyer before I touched it, it does point to vac pipes or fuel filter. No codes are present. All parts are genuine, purchased from Perrys Vauxhall Aylesbury. I'm at work tonight so will have to double check everything in the morning but thanks for response.

Key thoughts:

Fuel filter - Genuine?.....fitted the correct way round?

Genuine. Trade Club Part No.25313359 Fitted same as one that came off (arrow on filter showing flow)

Vac hoses - Connected up correctly, aprticularly the one at the rear of the plenum?

Top ones all OK. Will double check rear plenum one.

Fault codes - any present?...pedal test.

No codes present. Tested on proper garage code reader.

Air leaks - Is the brake servo pipe connected up and secure?

Will double check this tomorrow. At work now unfortunately.

And will others please avoid any comments relating to legal speeds etc as there is a problem here to diagnose so lets focus on that.

EDIT: Starting to think its fuel filter issue now as car runs too well in other areas.

[Boditza]

if those are not the problems maybe the gearbox.. clutches..

[YZ250]

Obviously it is something that I have replaced (or not replaced if it's vac hose).

As said by Marks DTM it is a case of eliminating the parts that I have removed. I'm sure that I have replaced everything correctly but the only way to tell is to run through it again especially as there are so many hoses behind the plenum.

As I'm now at work, tomorrows course of action will be to check all of the hoses, double check the fuel filter (may even put old one back on for elimation purposes) and if worse comes to worse I will have to put the old plugs back in.

Thankfully I won't have to do the cam covers this time so I might take the plenum back off and start again. Groundhog day.

As the car runs so well under 'normal' driving my biggest problem is testing it out after the work has been done. Might be a case of 'work by day' and 'test by night'.

I will update after work has been done over the weekend. Thanks all for your input.

Regards
Alan

[same #same#]

injector relay???

[Squatch]

The loss of power at the top end would suggest a problem with the rear multiram actuator. Have you been able to visually check its operation?

[VXL V6]

Well if you've got access to a Tech II / Opelscanner or "My Naff Code Reader" you can activate the multi-rams without running the engine. 

[tidla]

The loss of power at the top end would suggest a problem with the rear multiram actuator. Have you been able to visually check its operation?

or pipework

[martbax]

probably a stupid suggestion but are you sure that you haven't got a mat rucked up under the accelerator pedal to stop the last inch of travel?

[feeutfo]

The loss of power at the top end would suggest a problem with the rear multiram actuator. Have you been able to visually check its operation?

Absolutely cock on there IMO, get someone to rev the engine hard while you examine the multi ram, see if it moves, probably easier via tech 2 though, maybe visit The Boy in Brackley?

[feeutfo]

Ps, is the electrical connector plugged in on rear multi ram?