JohnMatt

iTrader: (3)

So about 2 months ago I change the plugs in my car and on my first start after letting it idle for a few I come back to it and the car has died. I restart it and it's idling rough and sounds like it's missing. It was dark so I drove it home with it randomly missing every minute or so let it sit for 2 days and it was acting fine again. Ran fine for a few weeks till one night it started acting up again but only for a minute then was fine again. Well last week I replaced my alternator and afterwards it starts the missing and bucking going down the road once in a while under a load like accelerating so I put in another set of new plugs, wires, cap and rotor and it's doing it almost all the time now with any kind of load and even alittle at idle and it's idling around 1700 or so. I replaced the TPS sensor when I got the car with a used one from a sc400 and has new o2 sensors as well. Could it be the used TPS is going bad? Maybe a bad ignitor or crank sensor? It doesn't seem like a fuel problem and it's got me pretty stomped but everytime I work on it it gets worse. I don't know what the hell to do with it. Ideas would be great thanks guys

LunaVyohr

Sounds to me like a fuel filter/fuel pump problem.

JohnMatt

iTrader: (3)

I thought about that but it seems odd it would do it right after changing the plugs. I've got a Walbro pump I can put in in prep for my turbo and it couldn't hurt putting a new fuel filter in since I don't know how old it is

skirts

iTrader: (1)

I have a 95 400 and I took it on a 4 hour road trip and it acted the same way bucking and jerking when I got off the interstate. I pulled my ecu fuse and let it sit and started it back up and it ran fine until I made the trip back home and got off the interstate. Pulled the fuse again and hasnt done it since. So I think that it could be an ecu problem and yours could be to.

JohnMatt

iTrader: (3)

Now that you mention it the PO did replace the ECU so maybe this one is going out too. I'm going to check all my connections, grounds and maybe do the 12v fuel pump mod in hopes something will work

skirts

iTrader: (1)

I read about a lot of ls400 owners sending their ecu's off to get fixed there is a company on ebay that does it

JohnMatt

iTrader: (3)

I think I might have found it. The wires on the plug for the dizzy aren't secured in the clip. Going to try and tape them down for now till I get another plug but all 4 wires could be pulled out with no effort

JohnMatt

iTrader: (3)

This was my problem

checkah76

could u tell me where the ecu fuse is located plaease?????

2jznosht

fuse box under the hood

checkah76

Thank u evyone for ur help when I changed the water pump we put the timing off 180 degrees all fixed now :-)