Misfire issue
#1
Driver School Candidate
Thread Starter
Misfire issue
I bought an 03 ls430 it ran great for a while and then started misfiring. I changed the coil packs and plugs and it didn't do anything. I cleared the codes twice and it started working normally for about 3 to 4 months. Now it's doing it again
The coil packs I put in weren't the greatest and they were cheap . Could this be my issue? Also notice like a black residue on the coil pack. Didn't look like oil because it was only on 1 or 2 of them and was dry on there. Almost looked like the rubber on the end was getting burned in there or something
The coil packs I put in weren't the greatest and they were cheap . Could this be my issue? Also notice like a black residue on the coil pack. Didn't look like oil because it was only on 1 or 2 of them and was dry on there. Almost looked like the rubber on the end was getting burned in there or something
#2
What are the codes? What kind of shape were the old plugs in? How many miles?
You need to determine which cylinders are misfiring and concentrate your efforts there. Since it appears to be somewhat intermittent I would be looking at the condition of the wiring to the cylinders in question...
You need to determine which cylinders are misfiring and concentrate your efforts there. Since it appears to be somewhat intermittent I would be looking at the condition of the wiring to the cylinders in question...
#3
Instructor
Check the coil connectors for loose wires. Seems to be common for the wires to loosen or be pulled out when handled. If you have certain cylinders misfiring, check those first. Then swap the coil to another cylinder and see if the misfire moves with it.
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Ls430mysht (08-15-20)
#4
Driver School Candidate
Thread Starter
What are the codes? What kind of shape were the old plugs in? How many miles?
You need to determine which cylinders are misfiring and concentrate your efforts there. Since it appears to be somewhat intermittent I would be looking at the condition of the wiring to the cylinders in question...
You need to determine which cylinders are misfiring and concentrate your efforts there. Since it appears to be somewhat intermittent I would be looking at the condition of the wiring to the cylinders in question...
#5
Driver School Candidate
Thread Starter
I will try that . Is there a starting point or a beginning for all the wires to be disconnected at once . Like the main connector . Sorry my terminology is crap lol
#6
Driver School Candidate
Thread Starter
Sorry I think I was replying wrong. I pulled the plugs they looked fine. Checked the coil packs they also look fine. Noted: just bought these plugs and coils about 4 months ago. I unhooked the battery for 30 min or so. Turned it on . And have the same issue but with not flashing check engine light. It comes back after idle at pr about 1500rpm. Still shaky and it smells like gas. Noted: this cars catalytic converters are gutted.
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