2000 Tundra - error diagnostic/no check engine light

I have just purchased a 2000 tundra w/209k.

It has a misfire, took it and got tested but the diagnostic came back with error message. Also have no check engine light.

Is there a way to check and find the problem without the computer? Or to get the computer back up and running.

 

Only thing I can think of is to unplug the battery terminals for a hour or so to reset everything. Youll know if it worked or not if the clock is reset.
Then try obd2 test it.
Maybe some more experienced guys can come here.

 

There's a fuse for the obd port, I can't remember if it's a 7.5 or 5. Should be in the block under the dash.

 

If you have a misfire like I did, it was with the coil that goes onto the spark plug. I did have an error code for my OBDII port, but I verified the correct cylinder with the following.

I started my engine and immediately got to work. I removed each coil pack above every spark plug one at the time and then listened carefully. When you remove just one coil like this you should hear your rpm/idle change in some manner. Continue doing this until you hear no change in rpm/idle. By this I mean, if you remove the coil pack from the spark plug and do not hear any change in rpm/idle then you know that is the misfiring cylinder. Many times it is safe to assume that your problem is the coil since that is what you removed, but it could also be your spark plugs. If you have any questions on this or need clarification please let me know.

Also if you replace your coil packs, only use Denso. I know it is tempting to buy the cheap knock-offs from Amazon, but in short time (normally 1 year or less) you will have issues with it. I got my single denso coil pack on Amazon for around $60-70 if I remember right. Worked perfectly.

One more thing, change the spark plugs while you're in there. It's easy on our trucks and makes a huge difference. I believe the proper replacement is NGK iridium, not 100% on that as it has been a bit since I did this. I'm certain someone else will chime in and correct me if I'm wrong.

Hope this helps!

 

Picked up 8 pack of Densos for about $400 on Big Gurl. Most of mine were cooked and or cracked upon inspection when replacing my Valve Cover Gaskets.

I already had previously had a shop replace just one coil that had gone bad and decided a few years later after doing VCG’s to do all 8 refreshed at the same time with new NGK Plugs (Copper Core).

 

ouch... That's spendy.

 

Yes. Yes it was, but at about $50 each unit cost not bad for Denso. Service shop charged me about $100 for 1 made in?

Reading the reviews on these Densos sealed the deal for me as many said to just do all at the same time (Lexus and Toy owners). Four of 8 were cracked and probably heading south to failure. Risk reward said spend the $400.