Engine/transmission

[almi52]

Hi, i'm new to the club, i recently sold my GS300, and bought an LS400, 1993 model. I have changed the cats and exhaust system right through, however

there is a lack of get up and go, I believe it could be passed by a trabant at the moment. It struggles to get to 50-60 mph. On hills it slows to a crawl.

It has also had a new coil pack, leads and plugs, making no difference. Is there an area that i should look at for a possible cause.

[steve2006]

Hi, i'm new to the club, i recently sold my GS300, and bought an LS400, 1993 model. I have changed the cats and exhaust system right through, however

there is a lack of get up and go, I believe it could be passed by a trabant at the moment. It struggles to get to 50-60 mph. On hills it slows to a crawl.

It has also had a new coil pack, leads and plugs, making no difference. Is there an area that i should look at for a possible cause.

Hi,

Welcome to the LOC.

Was everything OK before you changed the exhaust system? Is the Engine Management Light on? Does it rev to the red line when in neutral?Is it changing up through the gears OK,does the transmission kick down when you floor the throttle pedal?

Sorry for all the questions but we need a little more to go on here diagnostics over the internet are not easy at the best of times.

[almi52]

It was not ok before i changed the exhaust, one of the old cats, had broken up and was causing partial blockage, o/s cat had no internals at all, which is why i changed complete system.

There are no warning lights on. When the pedal is floored it does kick down, it seems sluggish with the changes, and can be a little jerky.

It does rev to the red line in neutral, But as my last V8 was a Rover 3500S P6, its difficult to say whether its a normal process as this engine is quiet and does'nt seem to make a fuss if you understand what i mean.

It also idles at about 800 rpm, quite steadily. On hills i change manually to 1ST gear and then as revs slowly pick up i change back to drive, its that gutless.

I have spoken to the previous owner, and i believe he is being less than truthfull with me. I can tell you no more . Many thanks.

[ROYT]

Do you feel happy that it's running on all 8 ?

You say you have changed a coil pack, is the other one OK?

[almi52]

Do you feel happy that it's running on all 8 ?

You say you have changed a coil pack, is the other one OK?

The previous owner changed the coil pack and leads, i'm waiting for confirmation on one or both.

Yes im happy its running on all 8. It isn't missing, but i will check tomorrow that all leads are correctly fitted.

Apparently only one was changed. Can you enlighten me as to the location of both.

[almi52]

Do you feel happy that it's running on all 8 ?

You say you have changed a coil pack, is the other one OK?

The previous owner changed the coil pack and leads, i'm waiting for confirmation on one or both.

Yes im happy its running on all 8. It isn't missing, but i will check tomorrow that all leads are correctly fitted.

Apparently only one was changed. Can you enlighten me as to the location of both.

Well all, i have discovered the problem this morning, on taking off all the plastic work on right hand cylinder bank, the new coil lead had been trapped and

cut in two, fortunately previous owner had left old leads in boot. Fitted lead and fired her up, WOW. Put it all back together, been for a run, goes like the preverbial

Faith restored in lexus. Thanks for contributions, got the grey matter working. Allan.

[steve2006]

Excellent result, don't tell me the coil HT lead to the distributor on the passenger side was the damaged lead as it passed through the hole in the upper cambelt cover and the rubber grommit was missing?

[almi52]

Excellent result, don't tell me the coil HT lead to the distributor on the passenger side was the damaged lead as it passed through the hole in the upper cambelt cover and the rubber grommit was missing?

Yes correct, it was missing, i have a selection of grommits so i replaced that at the same time. thanks to all for your help.