Misfire -- I think

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Liquid_force

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After work the other day I noticed it wasn't running like usual.
There was a miss at idle. Seemed to run a little better on the hwy.
Sounded a little louder from under the hood at idle as well.

I poked around and found yet another apparent error by my $1200 torque converter technician.
The tube from the air box to the throttle body wasn't installed correctly and the band had pinched the section at the bottom.

Ok, cool, easy fix. (the SES light never lit).

However - in the process I broke the tee fitting by the TB.
After 15 min of gd's and mf's I finally got all 3 of the broken barbed ends out of their respective air hoses. Stopped at advance for a replacement tee and got it all back together.

Good to go, right? No.
Still a miss. If anything it's worse. At 2.5-3k there's an obvious miss and vibration that wasn't apparent before I started the repair.

SES lights now. And during extended perioids of constant acceleration (up a hill for ~15 sec) the SES starts blinking. On flat road it doesn't blink but stays lit.

4 of my coils have about 45k on them. The other four may be original (138k).
On my way to get a code scan in the next few mins.

Another consideration -- the replacement tee fitting I found fits fine, but the internal diameter is noticeably smaller than the original fitting. Could that be effecting air flow enough to cause a constant miss?
 

My_Silver_SHO

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Isn't blinking SES symptom of overheating transmission fluid?


My Bad: A flashing OD light is indicative of the fluid temp being way too high. Sorry for the confusion.
 
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Liquid_force

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p0303

I'll start with a coil as ebay replacements are only $11 and this set lasted me over 40k.

#3's on the back bank isn't it?
PS is #1, DS is #4

I may just get 4 new ones.
 

Liquid_force

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I had two old MC coils that I think are still good from when I had the cams welded so I put one in tonight. Not quite buttoned up yet, but I'll have it running again in the morning.

I just hope it solves the problem. Never fun getting to the back coils.
 

93markVIII

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Isn't blinking SES symptom of overheating transmission fluid?

dunno about that. but blinking can definitely mean misfire.
sure sounds like a dying coil. looks like you've got it covered.
 
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Liquid_force

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Started and idled perfectly smooth.
Haven't had it on the road yet, but for now - problem appears solved.

Broke the washer fluid tube in the process -- and it snowed last night!! Grrr!
 

Bull Geek

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Flashing service engine soon/check engine light = severe engine misfire. Also means damage to your catalytic converters could happen. If it's flashing in future, best to shut the car down ASAP and pull over.
 

Liquid_force

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Car's running fine.

And I patched the broken washer fluid tube by sleeving it with a few inches of 1/4" fuel vapor hose :)

:woo-hoo: for fast free fixes
 

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