Can anyone help with my latest problem?

[Kev@carnoisseur]

I picked my esprit up last week after paying a very big repair bill and leaving with over 300bhp (which softend the blow a bit!) and the car was flying!!
A week down the line and its running like s**t again!
Normal off boost driving and the car seems fine, but when I floor it the car only fires on three and just dont want to know.
If I slowly feed the power in by pressing the pedal lightly until full thottle it cougths and splutters a bit but goes a lot better then just flooring it.
I changed the plugs from denso iridiums to a 'recommended' champion plug which has made the problem worse.
But then I checked the gap settings and they where slightly to tight, and that seems to have made it slghtly better, but still s**t.
The H.T leads look a bit worn so I have ordred a new set ( magnercor R-100 racing 10mm).
I have also ordered a set of NGK plugs.

The SE runs 15psi and super unleaded at all times, but as I say it was running awsome when I picked it up and very very fast until this problem accured a week later.
Could it be the leads or plugs???

Any ideas???????????

[dr.hess]

Could be ignition related. I had a similar problem with a 20v Toyota motor that was solved by adding an MSD6A. After new plugs and wires, think about those coil pack thingies. It is a GM part. I would also check the compression while you have the plugs out.

Dr.Hess

[lotusguy]

Kev,

Make sure that with all that 'New' power that you haven't jumped a tooth on the timing belt. Jumping a single tooth won't hurt the head, but will advance/retard the engine timing some 18 degrees and while it will run, it will run as you describe. Happy Motoring! ...Jim'85TE

[B16 RFF]

Kev@carnoisseur said:

I picked my esprit up last week after paying a very big repair bill and leaving with over 300bhp (which softend the blow a bit!) and the car was flying!! A week down the line and its running like s**t again! Normal off boost driving and the car seems fine, but when I floor it the car only fires on three and just dont want to know. If I slowly feed the power in by pressing the pedal lightly until full thottle it cougths and splutters a bit but goes a lot better then just flooring it. I changed the plugs from denso iridiums to a 'recommended' champion plug which has made the problem worse. But then I checked the gap settings and they where slightly to tight, and that seems to have made it slghtly better, but still s**t. The H.T leads look a bit worn so I have ordred a new set ( magnercor R-100 racing 10mm). I have also ordered a set of NGK plugs. The SE runs 15psi and super unleaded at all times, but as I say it was running awsome when I picked it up and very very fast until this problem accured a week later. Could it be the leads or plugs??? Any ideas???????????

Sounds like an HT problem as the prime suspect. I would want to do a compression check, just to reassure myself all was well with pistons/valves though.
Paul.

[Kev@carnoisseur]

Update:-

Changed the leads today, let car get up to to temp.
Was going well, no breaking up pulling strong how it was when I first got it back.

After 10 minutes the problem started again!!
Could it be ACT too high?
I have a inlet temp gauge and on idle is between 23C-26C and on the move is between 18C-20C.

Thats before it passes through the charge cooler.

Any ideas?

[oharedm]

Kev,



You are really not going to get to the bottom of your problem until you do some Freescan data logs.


www.lotusespritworld.co.uk/EMaintenance/freescan.html

Regards
Dermot

[maigret]

I went through a spell last year with ignition problems. 3 rotors in 3 months. Turned out to be bad batch of Bosch rotors in NZ. Used a Lucas one and no problems since.

[cnh1990]

The Champion plugs are nasty you will have better luck with NGK. Also check to see that you are not going into overboost and the turbo capsule/wastegate is work or engaging correctly without it working right the fuel pumps will cut out and the engine will sputter after momentarily going on high boost.