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  ProbeTalk.com Forums > Tech Section > 2nd Gen (93-97) V6 2.5L

2nd Gen (93-97) V6 2.5L Discussion of Maint Issues for V6

 
April 27th, 2020, 09:54 AM   #1
halfriceboy
Six Star Member
 
 
: Oct 2001
: Wichita, Pittsburg, Kansas City
: 35
: 8,045
ZE running poorly

My '95 gets driven only a few times per year. It seems to be running poorly and I barely have motivation to work on it, so I'm posting here. It seems to have a misfire on maybe 1-2 cylinder under heavy throttle load (>80% throttle), and this happens 50% of the hard pulls, in any gear, and only happens once the car engine is warm and the parts are nice and heatsoaked. Where should I start troubleshooting?

1995 GT
ZE
Colt Superstreet cams
64mm throttle body
Hotshot headers, test pipe, Borla catback
Short intake (filter at VAF)
Plugs: NGK BKR-6E11 (the 4 cylinder plugs), four are light-tan, two are red-light-tan. A couple weren't super tight, but even after installing tightly the misfire is still there.
Plug wires: 15 year old NGK blues
Gasoline: 8 month old non-ethanol premium with stabilizer, tank was fully drained and filled 8 months ago
Fuel Pump: Walbro 190
Oxygen sensor codes that have been there for about 10+ years
__________________
-Jay
ASE Master Certified
ASE L1 Advanced Engine Performance Specialist


daily - '95 PGT mtx stock



 
April 27th, 2020, 08:39 PM   #2
lasergts
Donating Member
 
: Oct 2000
: La.
: 74
i'm sure you've thought about the distributor and i've had one of those same plugs go bad with only a few miles on them
 
April 27th, 2020, 11:55 PM   #3
BLUEnoEQ
Senior Member
 
: Jun 2009
: Ohio
: 2,160
Last time that happened with mine, it was the coil inside the distributor. I use a 95 disty. New coil was $27-28 shipped to my door from Rock auto.

Also had a miss I couldn't get rid of that turned out to be the crank pulley loosened up and destroyed the woodruff key, pulley, and mashed the crank keyway a bit. New key, different pulley and a little JB weld filler and the miss was gone. It's had many shifts at 7k since the repair. When the pulley was loose it would misfire on #1. Tried everything over and over to figure out the problem. Also had random heat spikes on some longer drives until I replaced the coil.

Even if the coil doesn't fix this problem, this time, it's good to have a known good one around.
__________________
Probe out for Harambe
94 PGT KLZE






 
May 3rd, 2020, 04:14 PM   #4
halfriceboy
Six Star Member
 
 
: Oct 2001
: Wichita, Pittsburg, Kansas City
: 35
: 8,045
I put a coil on it, misfire was still there. I replaced the plugs and the misfire was gone. It runs strong now, I actually beat a 325hp Infiniti QX70 getting into the highway. Thanks guys!!

I do have a code 02 for crank sensor, wonder if that’s related to my intermittent long cranking times.
__________________
-Jay
ASE Master Certified
ASE L1 Advanced Engine Performance Specialist


daily - '95 PGT mtx stock



 
May 5th, 2020, 07:40 PM   #5
mac1
Probe has-been
 
 
: Jun 2001
: Phoenix
: 13,964
Sure is!
__________________
1993 Mercury tRacer :Vitara & mFactory: was my #1
1994 Mercury TrAcer Wagon : '02 SPI swap : the loaner
2001 Hyundai Accent 2.0L-T3 swaphas flat pots
2014 Factory Five 818s EJ255t :it's adorable
2000 Lotus esprit v8TT : under the knife 2018
2003 Pathfinder 200k miles : The daily
No I do not Uber any of these
 

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