Interesting problem

paxam · 10-04-2008, 06:09 PM

all
I have a 02 v6 s.c. when I am between 1800 and 3k light load it feels like the engine is cutting out for a second or two. I looked at the plugs and appear to be fine slightly black inside but the electrode is in good shape. the gap was at .040 to my supprise I regapped them to .031 -.032. also I cleaned the mass airflow sensor,air filter and throttle body. I am assuming it is a coil so I got a new one and swapped it out with each one but still it is dying. I check the resistance of all of the coils hot and cold primary winding and secondary all are with in .5 ohms... I am not getting any codes.
Also I drained the fuel and put fresh 93 + octaine boost in the tank.

any Ideas?

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KdF · 10-05-2008, 01:04 AM

You seem convinced it's electrical.

Did you change the wires?

Also.......Fuel filter.

Ya, I know but they do not last forever.

paxam · 10-05-2008, 07:44 AM

the plug wires are 6 months old. NGK wires. fuel filter was done in Jan.
the electrical is a starting point since it is all controled by a computer.

KdF · 10-05-2008, 09:07 AM

My Dad's Ford years ago had the same symptoms and it turned out to be a bad plug wire. They can come out of the box bad.

Just sayin.........

jeremy9allen · 10-05-2008, 01:00 PM

How many miles on those plugs? They can look great but still miss under lite loads. Ford 4.6L are notorious for that. The plugs will look good and be in gap, but have an intermittant miss.

paxam · 10-05-2008, 02:01 PM

I think I found it..
a bad TPS I ohm out the orig and there is a spot that the resistance goes crazyfrom 400 Ohms to 1.2 then back to 420 ohms . I put my spare in and ran it so far no dying and my idle is back to 750 rpm's...
the plugs are less then a year and the wires 6 months or so.

jeremy9allen · 10-05-2008, 06:46 PM

That would do it.

j-man · 10-05-2008, 06:57 PM

welcome to the world of bad tps sensors for the 02-04 tacomas, especially for those with forced induction. You will go thru them about every year or so. Last i checked, you couldnt buy them individually, you had to buy the whole darn throttle body, at least for my old 03 dbl cab i had. Good luck.

DailyDrive · 10-06-2008, 05:57 AM

Quote:

Originally Posted by paxam

I think I found it..
a bad TPS I ohm out the orig and there is a spot that the resistance goes crazyfrom 400 Ohms to 1.2 then back to 420 ohms . I put my spare in and ran it so far no dying and my idle is back to 750 rpm's...
the plugs are less then a year and the wires 6 months or so.

That's exactly why any real tool box since the mid 90's should have an ODBII reader. This issue could have been found in under 3 minutes (literally).

j-man · 10-06-2008, 08:42 AM

Quote:

Originally Posted by DailyDrive

That's exactly why any real tool box since the mid 90's should have an ODBII reader. This issue could have been found in under 3 minutes (literally).

no, actually the TPS starts to go bad before a code is ever thrown quite often. So the only real way to check is get a ohm reader and check it just like paxam did.

DailyDrive · 10-06-2008, 02:37 PM

Quote:

Originally Posted by j-man

no, actually the TPS starts to go bad before a code is ever thrown quite often. So the only real way to check is get a ohm reader and check it just like paxam did.

see, you haven't even seen an ODBII reader. you might have seen ODBII code readers.

An ODBII reader will show values right on the screen that the ECU sees coming off the TPS. All you do is hook it up, slowly press the gas pedal and look at the values the TPS is sending back. This test actually takes about 10 seconds to perform, if not counting the time to hook up the ODBII reader.

j-man · 10-06-2008, 03:38 PM

Quote:

Originally Posted by DailyDrive

see, you haven't even seen an ODBII reader. you might have seen ODBII code readers.

An ODBII reader will show values right on the screen that the ECU sees coming off the TPS. All you do is hook it up, slowly press the gas pedal and look at the values the TPS is sending back. This test actually takes about 10 seconds to perform, if not counting the time to hook up the ODBII reader.

shnizzle - i learn something new everyday...

DailyDrive · 10-06-2008, 05:12 PM

yeah, you could fix a Model T with a hammer. A carburetored car with a wrench set. But for the last 15 years the first tool out of the toolbox should have been an ODBII reader

Ron Helmuth · 10-08-2008, 01:56 AM

Quote:

Originally Posted by DailyDrive

yeah, you could fix a Model T with a hammer. A carburetored car with a wrench set. But for the last 15 years the first tool out of the toolbox should have been an ODBII reader

this is good info from all of you and I learned a lot. Is it necessary to spend around $100 for one? I welcome a brand and model number and value the opinions you guys have about these matters.

DailyDrive · 10-08-2008, 06:14 PM

Plenty of companies make ODBII readers, though I prefer Auterra with a handheld Palm. It will be a bit over $100, but doesn't mean you can't split that and share it with other. The economy is going down the

so it's a good habit to get into anyway

Ron Helmuth · 10-10-2008, 05:18 PM

thank you

asked and answered I like these simple threads

I appreciate the recommendation

10-05-2008, 01:04 AM	#2 (permalink)
KdF Registered User Join Date: Sep 2007 Location: Austin Texas Posts: 53	You seem convinced it's electrical. Did you change the wires? Also.......Fuel filter. Ya, I know but they do not last forever. __________________ KdF In Memory of my Only Son Chris 99 Taco Prerunner Full OME Suspension Replacement Poly Bushings (all) replacement Greasable shackles

10-05-2008, 07:44 AM	#3 (permalink)
paxam Contributing Member Join Date: May 2003 Location: S florida Posts: 190	the plug wires are 6 months old. NGK wires. fuel filter was done in Jan. the electrical is a starting point since it is all controled by a computer. __________________ TRD Supercharger,TRD 7th injector,URD AIC ,Headers,2.5 Magnaflow exhaust,Airfilter,air box mod,flexalite 210 fans,optima yellow top,Warbro 190 ,TRD t stat,ramsey 8000 winch and rear locker mod

10-05-2008, 09:07 AM	#4 (permalink)
KdF Registered User Join Date: Sep 2007 Location: Austin Texas Posts: 53	My Dad's Ford years ago had the same symptoms and it turned out to be a bad plug wire. They can come out of the box bad. Just sayin......... __________________ KdF In Memory of my Only Son Chris 99 Taco Prerunner Full OME Suspension Replacement Poly Bushings (all) replacement Greasable shackles

10-05-2008, 01:00 PM	#5 (permalink)
jeremy9allen Registered User Join Date: Jul 2008 Location: Wilmington, Il Posts: 131	How many miles on those plugs? They can look great but still miss under lite loads. Ford 4.6L are notorious for that. The plugs will look good and be in gap, but have an intermittant miss. __________________ 97 4runner SR5 Locked, Lift, Sliders, 33" Bighorns, 2 TRD stickers 5hp each= 10hp+ 83 Toyota Pickup Shortbed 4x4 Lift, 33" BFG M/T, Lincoln Locker

10-05-2008, 02:01 PM	#6 (permalink)
paxam Contributing Member Join Date: May 2003 Location: S florida Posts: 190	I think I found it.. a bad TPS I ohm out the orig and there is a spot that the resistance goes crazyfrom 400 Ohms to 1.2 then back to 420 ohms . I put my spare in and ran it so far no dying and my idle is back to 750 rpm's... the plugs are less then a year and the wires 6 months or so. __________________ TRD Supercharger,TRD 7th injector,URD AIC ,Headers,2.5 Magnaflow exhaust,Airfilter,air box mod,flexalite 210 fans,optima yellow top,Warbro 190 ,TRD t stat,ramsey 8000 winch and rear locker mod

10-05-2008, 06:46 PM	#7 (permalink)
jeremy9allen Registered User Join Date: Jul 2008 Location: Wilmington, Il Posts: 131	That would do it. __________________ 97 4runner SR5 Locked, Lift, Sliders, 33" Bighorns, 2 TRD stickers 5hp each= 10hp+ 83 Toyota Pickup Shortbed 4x4 Lift, 33" BFG M/T, Lincoln Locker

10-05-2008, 06:57 PM	#8 (permalink)
j-man Registered User Join Date: Feb 2007 Location: Santa Monica, Ca Posts: 207	welcome to the world of bad tps sensors for the 02-04 tacomas, especially for those with forced induction. You will go thru them about every year or so. Last i checked, you couldnt buy them individually, you had to buy the whole darn throttle body, at least for my old 03 dbl cab i had. Good luck. __________________ 2000 4Runner v6 sr5 4x4 5spd: Turbo'ed 99 4Runner v6 Sr5 4x4 5spd: Saw's / OME combo TrueTrac rear 98 4Runner V6 Sr5 4x4 5spd E-locker: Saws / OME combo... EEZI AWN Roof Tent 1.4m 97 4Runner V6 Sr5 4x4 Auto: Saws / OME combo TrueTrac rear 2003 Landcruiser 285 BFG At's and outback roofrack My Baja Trailer Build: http://forum.ih8mud.com/showthread.php?t=179520 http://community.webshots.com/user/bajaroadtrain

10-06-2008, 05:12 PM	#13 (permalink)
DailyDrive Registered User Join Date: Apr 2008 Posts: 315	yeah, you could fix a Model T with a hammer. A carburetored car with a wrench set. But for the last 15 years the first tool out of the toolbox should have been an ODBII reader __________________ '99 4WD 3.4L SR5 AT

10-08-2008, 06:14 PM	#15 (permalink)
DailyDrive Registered User Join Date: Apr 2008 Posts: 315	Plenty of companies make ODBII readers, though I prefer Auterra with a handheld Palm. It will be a bit over $100, but doesn't mean you can't split that and share it with other. The economy is going down the so it's a good habit to get into anyway __________________ '99 4WD 3.4L SR5 AT

10-10-2008, 05:18 PM	#16 (permalink)
Ron Helmuth Registered User Join Date: May 2007 Location: Denver metro area-CO Posts: 1,338	thank you asked and answered I like these simple threads I appreciate the recommendation __________________ 99 4Runner SR5 4wd 3.4/5 spd- Fact. Rr. Locker/Diff Breather Ext. Old Man Emu lift springs- 881 fronts/890 rears O/M/E shocks- N91s fr./N86 rr. All Pro Off Road welded sliders-prevent body damage! ARB"Taco"bumper/Gamiviti clear lenses/Hella 500s Redline Tuning hood struts/Bushwacker Extend a Fenders all my photos are over on Facebook now-I gave up on photo hosting sorry.... http://www.facebook.com/album.php?ai...5&l=5795132731

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