Is Your 3.4l Igniter Too Hot To Touch After Driving?

coleb10

New member
Hoping someone out there can do their own test and report back here.

I recently drove my '97 V-6 to the grocery store and when I came back out the Runner would not start. Turned over but no start. Second occasion this summer it has happened and both times the outside air temperature was over 100 degrees. After taking my frozen items back in to return them I knew I had to cruise around in the store and kill some time before it would start again. After waiting about 45 minutes it started up and ran perfectly all the way to my local Toyota garage. All the usual troubleshooting and testing was tried and everything checked out fine.
No CEL's or codes.
Fuel pump works perfectly.
Main relay and EFI relay good.
All connectors and power from computer normal.
My local independent Toyota guy kept it overnight to do a cold start the next day. The next morning it started right up.
He let it idle for 2 hours then turned it off.
Attempted to start again and it wouldn't do it. Turned over but no start.
Since he tried everything else he inspected the igniter (P/N 89621-35020) and it was blazing hot. You couldn't hold your hand on it for even a full second. He blew compressed air on it for 2 minutes and then the truck started right up with no hesitation.

We decided to unbolt the igniter from the fender well and move it slightly farther away from the engine. It is currently zip-tied up in the air and close to the air box. It is no longer sitting on the metal fender well. I have been hesitant to drive it lately but it also has not been as hot either. However, it is going to be around 100 degrees here this next week so I may do some testing with it close to the house. Maybe [MENTION=66389]BlackWorksInc[/MENTION] or someone else has seen this before. Mostly just wondering if this is a sign of starting to fail. Sounds likely but just don't know. Thanks in advance for any help or suggestions. If someone can just place their hand on the igniter after driving a while and see if it is hot maybe this will give me my answer.
 
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Hoping someone out there can do their own test and report back here.

I recently drove my '97 V-6 to the grocery store and when I came back out the Runner would not start. Turned over but no start. Second occasion this summer it has happened and both times the outside air temperature was over 100 degrees. After taking my frozen items back in to return them I knew I had to cruise around in the store and kill some time before it would start again. After waiting about 45 minutes it started up and ran perfectly all the way to my local Toyota garage. All the usual troubleshooting and testing was tried and everything checked out fine.
No CEL's or codes.
Fuel pump works perfectly.
Main relay and EFI relay good.
All connectors and power from computer normal.
My local independent Toyota guy kept it overnight to do a cold start the next day. The next morning it started right up.
He let it idle for 2 hours then turned it off.
Attempted to start again and it wouldn't do it. Turned over but no start.
Since he tried everything else he inspected the igniter and it was blazing hot. You couldn't hold your hand on it for even a full second. He blew compressed air on it for 2 minutes and then the truck started right up with no hesitation.

We decided to unbolt the igniter from the fender well and move it slightly farther away from the engine. It is currently zip-tied up in the air and close to the air box. It is no longer sitting on the metal fender well. I have been hesitant to drive it lately but it also has not been as hot either. However, it is going to be around 100 degrees here this next week so I may do some testing with it close to the house. Maybe [MENTION=66389]BlackWorksInc[/MENTION] or someone else has seen this before. Mostly just wondering if this is a sign of starting to fail. Sounds likely but just don't know. Thanks in advance for any help or suggestions. If someone can just place their hand on the igniter after driving a while and see if it is hot maybe this will give me my answer.

Sometimes bad groundings cause this kind of problem. An easy and cheap trial would be to run a second, 4 or 8 gauge wire from your battery to your engine as a backup ground.
 
Never heard of one getting too hot on a 4runner but back in the 80s and 90s Ford used a electronic module called a TFI on their distributors that would send a signal to fire the coil(s). If it got too hot the car/truck would die or not crank. Ultimately Ford relocated the TFI to a more cooler location and the problem was all but gone.

I would look at all grounds, battery cables, make sure the IAC is working correctly and even swap out the EFI fuse with a new or known good working one. Nothing kills electronics like heat.

Will check the coil temp next long drive with a IR thermometer.
 

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