Oh dear, whats wrong now?

[Welsh Dan]

Righto, out and about today, put my foot down on the motorway, which was followed by a splutter at about 5-6k rpm. Slowed down, and noticed that at lower revs, it sounded like it was misfiring. As soon as you got above 3k though, it appeared to clear and although it sounded slightly different, it was pulling ok. A few minutes later the coolant light came on, and it was topped up with coolant accordingly. However, it was still creating boost, so its not a boost leak.

On the way back, it seemed to be the same. However, increased the revs to about 4500, when all of a sudden the car just slowed down loads and bogged down. After that, it was a struggle to accelerate and it sounded completely different. It absolutely stinks of petrol under the bonnet now, but its still creating boost and according to a friend it was popping loads of small flames

To summarize;
Complete lack of power
Bogging down loads
Too much fuel
Still boosting.

It appears to start ok ish, but i\'m at a loss as to what it is, but someone has suggested the manifold could have cracked? Could it be this, or have the tips gone to the great tip heaven in the sky?
Its an FD running a single and all the bits to go with it.

[Gman]

My old twin turbo did this, turned out it was over boosting an hitting fuel cut when giving it some welly.

[Welsh Dan]

But that would surely go back to normal. It sounds like it overboosted, but the wastegate should surely have stopped that and even so, why would it still be running like a bag of spanners?

[Gman]

Is it boosting to what it should be?

[rx7veilside]

if u had lost a tip or two the boost gge wld flutter at idle and car wld run rough it wld also shake the car depending on how many tips have gone.i had 2 go and the car wld drive fine but wld idle like a bag of **** and gge wld flutter and was hard to start when warm.dont whatever u do try to boost it until u have found out problem..mine also is a single running uprated everything but my vac line to the fuel pressure reg split and i think i lost pressure to the reg at the wrong moment causing it to run lean as it was only boosting to 1 bar

[Initial-D]

Sorry to hear your having probs Dan, hope you get it sorted!!

[Welsh Dan]

Is it boosting to what it should be?

It was after the first incident, but after the second I didn\'t dare take it past 0.4 bar (and the fact that it took ages to get there).

Its still making boost, but it really feels like something is clogged up and holding it back. I haven\'t got a Cat, so its not that.

[rx7veilside]

what is boost gge doing at idle as a blown tip will show up by fluttering due loosing compression as the rotor moves

[Welsh Dan]

The boost gauge is hardly moving at all.

[Welsh Dan]

Someone also suggested the plugs could be knackered?

[Mave]

When I had a problem with loose plug leads, it felt like it was bogging down above 3K revs, although it idled fine.

[Wav]

The boost gauge is hardly moving at all.

But does it flutter at idle? even slightly? it shouldn\'t move at all.

Paul

[Welsh Dan]

It\'s at -350mm/hg, and when I say hardly moving, its about +/- 1mm either side

[royston1xx]

Have you checked the boost/map sensor vac line is still connected? If it is still connected it does sound like you may have lost a tip. What boost were you running at the time?

[rx7veilside]

-350 is very low for idle reading that is roughly what mine was sitting at with 2 lost tips/if they were not completly broken u wld get less fluttering..when i revd the car the vac wl increase but as soon as i let off the pedal it wld loose vac pressure..my bailey dump valve wld barely stay open once the car had warmed up..my vac reading at idle was normally about -550-600.i was gutted when it happened..i was getting lower boost reading on wot and when i was testing for problem vac line supplying pressure to the reg burst so lost fuel pressure at wrong moment and pop...if i had the money i wld put a v8 in mine have never known a car to be so tempramental there is allways something wrong with them it seems