Filled up with gas this A.M. Missfire on cylinder 4 100ft out of the parking lot.

Joined
Jul 17, 2018
Messages
1,794
Location
LUGOFF, SC
SOB!
Having a hard time believing it's just coincidence that I suddenly lose a fuel injector.
I'll run all the standard diagnostics but my guess is I have 25 gallons of fuel I probably have to dump and a clogged injector.

Any thoughts from the collective?
 
Joined
Nov 9, 2012
Messages
13,024
Location
Olathe, KS, USA
SOB!
Having a hard time believing it's just coincidence that I suddenly lose a fuel injector.
I'll run all the standard diagnostics but my guess is I have 25 gallons of fuel I probably have to dump and a clogged injector.

Any thoughts from the collective?
You have two fuel filters between the pump and the injectors.

If you bought fuel from a "busy" gas station, odds are it's not the fuel.

If it's from a no-name fuel station that is never busy, you may have water or poor quality fuel, but it will still run.

I think you're getting OCD about it. It will most likely work itself out or it's a separate issue from a loose or damaged wire.

Also, pull the EFI fuse to clear all settings and see if it resets.

Take a breath, slowly in and out......
 
Joined
Dec 10, 2007
Messages
8,829
Maybe check the spark plug wire connection on the dizzy cap and the spark plug??

100 feet may not be enough time/distance for any kerapp in the new gas to get to your injectors. The couple times I've gotten bad fuel it took ?? 1-3 miles before the engine started to cough IIRC.

One day twenty years ago after visiting a dealer service dept I got a misfire on #3 while on a trip, turned out to be a loose wire on #3 spark plug. Another time I found a poor connection at one of the wire towers on the dizzy cap (it was after that when I started to do most service/repairs myself).

FWIW
 
Last edited:
Joined
Jul 17, 2018
Messages
1,794
Location
LUGOFF, SC
Found it...
I was holding the spark plug boot in the area of the red circle with the plug grounded to the lifting hook; when my wife pulsed the key, the jolt knocked me off my foot stool. WOW the igniter's working!

Pretty sure I'm not supposed to get shocked holding the insulator....:rolleyes: Dammit that hurt.
1649630839675.png
 
Joined
Dec 10, 2007
Messages
8,829
So was it a bad/loose connection, defective spark plug wire, or??
 

flintknapper

SILVER Star
Joined
May 22, 2004
Messages
11,193
Location
Deep East Texas
Found it...
I was holding the spark plug boot in the area of the red circle with the plug grounded to the lifting hook; when my wife pulsed the key, the jolt knocked me off my foot stool. WOW the igniter's working!

Pretty sure I'm not supposed to get shocked holding the insulator....:rolleyes: Dammit that hurt.
View attachment 2977196


Bet the Wifey 'snickered' a bit.

Mine would have laughed out loud.
 
Joined
Jul 17, 2018
Messages
1,794
Location
LUGOFF, SC
Bet the Wifey 'snickered' a bit.

Mine would have laughed out loud.
To her credit she was afraid she'd hurt me seriously. Definitely a keeper.👍
 
Joined
Jul 17, 2018
Messages
1,794
Location
LUGOFF, SC
So was it a bad/loose connection, defective spark plug wire, or??
Defective boot is my guess, I used NKG wires last time... genuine Toyota inbound.
 
Joined
Apr 14, 2016
Messages
2,096
Location
Oregon
Defective boot is my guess, I used NKG wires last time... genuine Toyota inbound.

After replacing the wire set, I hope you tear down the existing one to see exactly what went wrong. I just did some searching and couldn't find out how NGK sets are constructed. Could it be the extension tube coming unthreaded, or is it molded in place? Broken terminal ear?
 
Joined
Jul 17, 2018
Messages
1,794
Location
LUGOFF, SC
The boot I was holding just slips over the wire. It tagged me right through the boot.
 
Joined
Jul 17, 2018
Messages
1,794
Location
LUGOFF, SC
Defective boot is my guess, I used NKG wires last time... genuine Toyota inbound.
Update:
So I looked back through my records and lo and behold I did not change the wires last time I changed the plugs.
I did an ohms inspection per FSM and they passed the "greater than 2K ohms test." and that was 20K miles ago.
These were the plug wires put in by the PO at least 50K miles ago. I bought the rig at 211K and she's at 260900 today. Not bad after all.
The ohms test shows 400 to 600 ohms on these plug wires, so I guess I can't be too upset.
Runs much better.

Minor momentary panic...oops.
 
Last edited:

Users who are viewing this thread

Top Bottom