I have a 97 taco with a 1/4 mil on her and last week she started missing on me an check engine light came on. Code showed #2 misfire. No biggie been there done that so i replace plug and shes fine for a few miles comes back popped hood made sure wire was conected at coilpack and plug still there,last plug change i replaced wires also so i dug around and found an old wire drove her and she was fine for a few miles and it came back, to make along story short ive swapped coilpacks around ohmed them bought all new plugs and wires made sure injectors are pulsing and cant get rid of the misfire on cylinder 2. What weird is everything i do it will run great fora few miles maybe 10 sometimes and comes back. Its like im arcing but i done it all. Any ideas? Im gonna do a compresion test and valve leakdown this weekend but seems to me if i had problems there it wouldnt run good for awhile.

 

That sounds like a very weird situation. When it comes back does it come and go? Or just keep doing it?
Also if you shut the truck off and then drive again is it present?
The only thing i could think of is that maybe something else making it loose compression.

 

what motor?

 

Every once in awhile while driving it will come an go but for the most part it continues to miss till i either pull the plug swap a wire or something, i know it sounds crazy and makes me think im having connection problems . And when its missing and i turn it off and let sit its still there

 

It has the 3.4 motor sorry meant to tell that in 1st post

 

what spark plugs did you use? and what did the old one look like when you pulled it out?

 

I used ngk bkr5egp like i always have

 

And it looked normal not wet and not white looking

 

Check #2 injector to make sure it isn't going bad.

 

Ive listened to the injector for pulse and it sounds fine cant get to it without pulling the plenium to ohm but it pulses like the rest. I been wondering if theres something in it , should no this weekend takin it to abuddy that has the tools to check her out.

 

the 95.5-97 injectors did fail. It may be worth swapping it over to a spot where its easier to ohm it when its missing.

 

I was experiencing #2 and #3 misfire. Changed plugs, upstream O2, and cleaned MAF and problem went away....about 400 miles ago. Hasn't returned.

 

I had an injector fail intermittently in my 97. I used mechanics stethoscope to touch the injector while it was missing and the injector was dead.

 

Yea i e do e the scope deal getting good pulse while mine is missing

 

if your getting fuel, its the spark. maybe air but doubtfull.

 

Is it possible even if im getting a pulse i may be still have a faulty injector

 

Update: comp check done today ran engine to normal temp pulled plugs and everything to get to it checked 1st cyl an fig out my gauge was broke by time i rounded up new guage(1 hr) i continued all cylinders were 200 except #3 which was 180 my yota manual says lowest cant be lower than 25% so im good there im narrowing down to fuel. Will check reg pump and injectors tom.

 

I forgot to hold the throttle wide open would this have made a diff?

 

Went into the injectors today moved #2 put back together and now getting Misfire #1 so im gonna pull them back out and send them to witchhunter. Also in the process my heater core is leaking must have cracked a neck or something while pulling intake but i knew it wAs on its last leg anyways

 

Hi,
I have 2003 3.4 I degrease and clean the motor with water, two hours later motor started missing and check engine lit