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2002 Tundra 3.4l weak spark no start.

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Old 12-06-2018, 04:25 AM
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2002 Tundra 3.4l weak spark no start.

Whatís up guys, Iím having a problem with my tundra, itís an 02 3.4l 5speed. Truck drove and idled perfect before this. Was driving the truck all night got home at 10pm. Woke up next morning to go to work it fired up for about 10 seconds and died. Tried cranking again it fired up for 2 seconds and died. Got a ride to work brought home a scan tool and got a lean code so right away I put a new MAF in it and cleaned the IAC but no change. I figured it was a fuel issue so replaced the fuel pump and still no change, pulled the plugs they were shot, replaced em, tested the coil packs and they checked out good, went to crank it and STILL nothing. Tested for spark and itís a very very weak spark and the truck will not fire up...any ideas on what would cause a weak spark? Anything helps at this point. Thanks
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Old 12-06-2018, 04:20 PM
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Are the sparkplug wires due for replacement?

If the lean code happens to be P0171, I'd also check for air intake leaks.

Weak spark, gonna have to verify the ignition circuit, maybe poor connection, high resistance, or something. Even a weak battery is worth ruling out.



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Old 12-07-2018, 05:11 AM
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Originally Posted by 75w90mantraN View Post
Are the sparkplug wires due for replacement?

If the lean code happens to be P0171, I'd also check for air intake leaks.

Weak spark, gonna have to verify the ignition circuit, maybe poor connection, high resistance, or something. Even a weak battery is worth ruling out.
battery is about a year old, swaped out the ignitor from my brothers tundra, tested the cam and crank sensors and still nothing. The code I got was a 171 but scanned it last night and thereís no codes?! I really donít think my intake is bad but Iíll triple check tonight, not to mention Iím in Maine and work till 5 so Iím doing all this in my driveway in the dark when itís 20 degrees and Iím no mechanic. How would I go about testing the ignition circuit?
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Old 12-08-2018, 07:32 PM
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It be good to verify (explain) how you tested for spark, crank sensors, coil packs, and so forth. Many have stated they checked and checked, only to find out they had a misunderstanding on what constituted as 'checked.' Can mean many different ways.

When you checked coil packs, did you check wires too? If the wires are close to or beyond change interval, might as well throw new ones on. If you haven't touched those already.

Batteries vary in quality. Some are complete trash and last a yr or two. Colder weather can influence cranking ability especially if temps are 0 Celsius and below.

If you have and use a multimeter, that be the first step in checking the cranking/ignition circuitry.

Does your scan tool have specific testing and data gathering functions? Or just pulling codes?


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