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I have a 2001 Tundra, 4.7 engine, ever since the spark plugs...

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Question by TnTechTundra
Submitted on 10/21/2003
Related FAQ: Toyota Tundra FAQ
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I have a 2001 Tundra, 4.7 engine, ever since the spark plugs were changedit runs rough, sometimes when I am driving and come to a stop light it dies, I had it put on a machine and it shows no codes, any suggestions why it dies or how to fix it?  Please email suggestions to PJGant21@tntech.edu and it would be greatly appreciated.  Thanks.

Answer by mechanic
Submitted on 12/9/2003
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This could be a few things... First, check to see if the wires are running to their correct plugs, because it sounds like they're not in their correct alignment with the distributor cap; each plug has to fire in a specific order or the engine will run horribly and may die when idling. Next,check to see if they are the correct plugs, and if they are "gapped" correctly; even pre-gapped plugs should be checked for the correct gap. Also, if the wires were changed they might not be the correct suppression-rate. If these things are okay, you should then check your ignition coils that sit atop the plugs. Another thing to check is the timing, especially if someone did a full tune-up.. Even mechanics make mistakes, though they shouldn't...


Answer by JoeWan
Submitted on 12/22/2003
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4.7 Liter Tundra has a distributorless engine...


Answer by coptr911
Submitted on 5/13/2004
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I am using NGK "Iridium" plugs = BKR7EIX
This is one step "cooler" than the stock spark plugs. I live in the Desert where it is hot during the summer. Cooling an engine is hard to do out here. I have noticed a vast improvement after installing these plugs. You need to gap these too. BUT !! Be carefull how you gap Iridium plugs...Its very easy to break the "tips" off the electrode as I did on 1 plug. Then I had to order another one to replace it. $11.99 a plug is not cheap. Any body have any comments about this?? send me an E-Mail:SBaumgartner@dc.rr.com


Answer by stixx
Submitted on 2/16/2006
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Breaking off the tip, it happened to me also.


Answer by richiec6969
Submitted on 9/15/2006
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i have 1993 gmc suburban. recently changed spark plugs but negelected to gap them. ran truck for about 4 miles on them to get home.  Did or could I do any damage to the engine by running on non-gapped plugs for a while.


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