My GS300 engine misfire when warm
I personally would start with the basics first, And $30-$60 isnt expensive at all. And if that fixes your problem your good! If not all you did was a little "Preventive Maintenance"!!
By the way guys heres a quick link on the Sea-Foam how to. Its a pretty simple process if you follow the directions and have a little bit of patience!
I did my 98' GS300 in about 15 minutes or so, And she was smoking like a chimney!!
http://www.youtube.com/watch?v=vRAV5ln5cUc
I would agree on the injector/fuel cleaner. I personally Sea-Foam all of my vehicles when I first get them!
Follow the basics = Oil change. New PCV Valve. Clean MAF. Spark plug change ONLY USE = (Denso Iridium/Platinum, Or NGK Iridium/Platinum).
The mis-fire with no CEL can usually point to a fuel problem, And again not always. I had a lean code for a while, And we replaced the MAF and it fixed that problem. But the mis-fire kept spitting out P0300 And P0303. It ended up being a bad Spark Plug Wire!!
My 98' Has 130k. So I would grab a set of wires and you should be on your way!!
Follow the basics = Oil change. New PCV Valve. Clean MAF. Spark plug change ONLY USE = (Denso Iridium/Platinum, Or NGK Iridium/Platinum).
The mis-fire with no CEL can usually point to a fuel problem, And again not always. I had a lean code for a while, And we replaced the MAF and it fixed that problem. But the mis-fire kept spitting out P0300 And P0303. It ended up being a bad Spark Plug Wire!!
My 98' Has 130k. So I would grab a set of wires and you should be on your way!!
Driver School Candidate
Joined: Apr 2016
Posts: 2
Likes: 0
From: NY
I would agree on the injector/fuel cleaner. I personally Sea-Foam all of my vehicles when I first get them!
Follow the basics = Oil change. New PCV Valve. Clean MAF. Spark plug change ONLY USE = (Denso Iridium/Platinum, Or NGK Iridium/Platinum).
The mis-fire with no CEL can usually point to a fuel problem, And again not always. I had a lean code for a while, And we replaced the MAF and it fixed that problem. But the mis-fire kept spitting out P0300 And P0303. It ended up being a bad Spark Plug Wire!!
My 98' Has 130k. So I would grab a set of wires and you should be on your way!!
Follow the basics = Oil change. New PCV Valve. Clean MAF. Spark plug change ONLY USE = (Denso Iridium/Platinum, Or NGK Iridium/Platinum).
The mis-fire with no CEL can usually point to a fuel problem, And again not always. I had a lean code for a while, And we replaced the MAF and it fixed that problem. But the mis-fire kept spitting out P0300 And P0303. It ended up being a bad Spark Plug Wire!!
My 98' Has 130k. So I would grab a set of wires and you should be on your way!!
How would you solidify if it is a fuel problem? Should you disconnect a wire and see if it shoots out fuel? My maf is clean, my car slightly misfires and the rpm drops to 0 and car stays on. .. all spark plugs are new and a new 02 sensor, I use sea foam every so often. My car was turning over then dropping right away now it stays on for a while. Sorry to single you out, can you think of anything to be the problem
1st Gear
Joined: Jul 2025
Posts: 1
Likes: 0
Simila
Hi guys, my GS300 is in the garage now because it developed a misfire. It started fine but when the engine had been warmed up and running a few miles, it misfire. The engine sounds like its going to die and its shaking. My mechanic had changed the spark plugs, checked the coil packs but it still misfire. What causes it to happen and how it can be fix?
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