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Chev / GMC Misfire, poppet injector diagnosis, troubleshooting and replacement



http://www.wellsve.com/ This video demonstrates how to diagnose a sticky poppet injector utilizing scan tool and 5 gas techniques. The upper and lower intake are removed and replaced. The distributor cam sensor retard is re-synced using a scan tool. The re-sync also needs to be performed at times when a P0340 trouble code sets.

"The information presented in this program is based on a specific diagnostic case and might not directly apply to the vehicle you are repairing. We do not represent or warrant that the information presented is complete or error free. Please take all safety precautions. We disclaim any and all liability for losses, injuries or damages in connection with your repair."

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Добавлено: 5 лет
Длительность: 8:47
Комментарии: 227

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Комментарии:

Автор crackermoves (3 месяца)
HELP!! Great video!! I have a 2000 Chevy Astro van 4.6 Vortec and there is
a little coolant getting into the oil ( Not much) but when I did an oil
change it dripped green and came out separately from the oil and not mixed
like froth traditionally, however there are no signs of a blown head
gasket.. It runs perfect (Idles a little rough and sometimes takes off in
drive from a stop when I don't depress the gas pedal for a second) but
never overheats, plugs are dry and compression is 142-150 in all
cylinders.. Whats going on and is coolant squeaking in from the intake
manifold to the oil perhaps and just needs lower intake gaskets???? yikes
:-(...

Автор axlsegar jovi (4 месяца)
by far, the most helpful video for me. thanks for posting, markjhicks

Автор Mike Cornell (6 дней)


Автор Nathan Lorenzen (10 месяцев)
I've got a misfire as well. originally it was cyl. 3, now it's 4. replaced
catalytic, cap, rotor, plugs, wires, maf sensor, cleaned fuel system, new
fuel filter, don't really want to have to change head gaskets...

Автор urnightmareism (10 месяцев)
Mark. I have a 99 chevy astro I did a full tune up and was working good
later on it starts misfire, so I did the scan and got the PO300 and TPS so
I changed that TPS and its when away, but it now its back. well car start
normal no misfire but once it start running about 20 mph it stars jumping
and loose power. what could the problem be? I already change TPS 2 times
goes away and came back with the same problem.

Автор Blingadera Artisans (10 месяцев)
Thanks for the message. I really enjoyed your detailed explanation. I love
not just fixing something, but understanding how it fits into the big
picture too. I have a downed 96 Chevy Tahoe with a 5.7 liter engine. It's
fine until I have to brake. Then it won't see the gears. I have to pull
over, restart and it sees the gears again just fine....until I have to
brake again. I have been down for over a year now and I was wondering what
your recommendations would be. I have 2 lines dropping down out of the
brake fluid box, so I can imagine its a brake pressure reset thing, but I'm
just guessing. It seems to me there is no signal getting to the computer
that I have let off the brake and that I am now excelerating. That's just
this 1 gramma's guess. As a diy kinda gal with no tools. I'd like to be
able to at least sound intelligent or at least like I've been trying, when
my friend comes over to help...Thanks so much. 

Автор Steve Pribyl (11 месяцев)
Thank you for the advice and I will try the grind hole and reset the cam
timing retard value to 0 deg.

Автор Ladi Maat (11 месяцев)
Great info! I've had the rotor, cap, distributor, ignition coil, spider
injector, full tranny overhaul, something?intake replaced, vacuum leaks
were undetected and spark plugs/wires were fine, yet my '96 Chevy Suburban
still kicks out P0300. I'm getting extremely poor fuel mileage :/ and my
engine sounds like its running rough. All the cars pass me by unless I
press the gas more than usual which results in the rpm revving up high but
seem to go nowhere as far as speed is concerned. What could this be? The
mechanics seem to can't figure this mystery out! Does any of this sound
familiar to you Mark?

Автор Melody leeann Remedies (10 месяцев)
my names ryan i got a 1996 gmc sle and when i accelerate itvmissfires
unless i step on the gas it want stop until about 40mph then i park it came
out the next morning and it missfired really bad and the rpms would go up
but the speed would build really really slow and now it want even start it
will try to but it want only if i put gas on the air filter and then only
for a breif moment sombody help me i have no clue whats wrong

Автор Steve Pribyl (11 месяцев)
Mark, I tried to adjust the distributor to 0 deg but only able to get set
at -7 deg which had been at -12 deg, but this appears to be the problem
causing the misfires. That when I loosened and turned the distributor
clockwise it set the cam retard to more neg degree and I got misfires
counts similar as when the MIL light set. So I take that the timing chain
is perhaps worn. That I will likely have to remove distributor and grind
the hold down hole so I can get the cam retard setting to 0 deg. Thanks for
your respond and help. This will help me to look at other 4.3L GM vehicles
like this before doing repairs. 

Автор Hugo Calderon (1 год)
How do you change a camshaft sensor on a 96 chevy s10 4.3L Do you have to
take the distributor out...

Автор Steve Pribyl (11 месяцев)
Question about the Cam Retard resetting to 0 deg, how is this done have
scan tool and showing values of -12 to -13 deg? I have done a replacement
of the Injector unit, has been running fine till now. Now getting Misfires
on all cylinders, the worst in the 3 & 4, then the 2 & 5 is the next,
finally the 1 & 6 cyl is the least. Checking the Cap and Rotor, plus
Distributor wear. It appears ok, had replaced before the Injector unit
change and drove the vehicle for awhile. Any ideas?

Автор franklyn manzer (1 год)
A good video to watch if your having trouble with your car or truck
misfiring!

Автор markjhicks (4 года)
@frank0067 Either the plug is not firing or the cylinder is being flooded
... possible injector problem. Let me know what happens. Mark

Автор nobleheight (5 лет)
Oh wait. I just found a wikipedia article about AC induction motors. I
didn't even think they existed before this.

Автор markjhicks (5 лет)
Yes it could be.

Автор nobleheight (5 лет)
Is liquid gasoline pouring out of the EVAP canister caused by overfilling
the gas tank? I think this happens a lot on Hyundai Elantras.

Автор Ty Bigos (3 года)
I have a 2000 zr2 blazer 4wd 4.3

Автор yz100f (3 года)
if you look on my channel my 99 s10 4.3 starts then stalls three minutes
after running any help would be apreciated

Автор markjhicks (2 года)
Because of the HC, Co and Co2 readings it appeared to be running rich. We
didn't need to check fuel pressure, we just needed to confirm it was not
the computer holding the injector open. We confirmed this with the noid
light. But you are right another way to check it is by checking for
pressure leak down. Great question! Thank you, Mark Hicks Wells Vehicle
Electronics

Автор rich jania (2 года)
I have a 97 blazer 4x4 4.3 did a lower intake gasket replacement put every
thing back the way i took it apart i market every thing to line it all back
up. now i have a misfire on cyl #6 i have spark at the distributor and at
the end of the spark plug wire. put new ac delco plugs in and still has a
misfire. so im thinking its a fuel problem but i know i had a lil peace of
grease/oil chunk wedged on the lip of the intake valve so maybe its not
closing all the way and making me lose compression???

Автор nobleheight (5 лет)
Will too much ethanol content in the gasoline cause the MIL to come on and
for what DTC?

Автор Ty Bigos (3 года)
@markjhicks Thank you so much, ive been having non stop problems with my
blazer and just want it to run strong again. ill try the carb cleaner later
today.

Автор markjhicks (5 лет)
If the ports and EGR are open the engine will not idle. The EGR momentarily
opens upon acceleration.

Автор markjhicks (5 лет)
If you dont have a flex fuel vehicle the computer will compensate for E10
through fuel trim adjustments. On a flex fuel vehicle there is a sensor to
tell the computer alcohol content. Go to the Wells website and read the
newsletters Volume 11 issues 1 and 2 Present & Future Power trains - are
you ready? This is covered in them. Mark

Автор Kevin Town (3 года)
I have the same 4.3 6 cylinder engine in my 96 Chevy pick-up. This is the
worse engine, I have constant problems with it, I have replaced the
distributor 5 times, there is rapid misfire codes, NO power with towing
(Small trailer) and on and on. Now my truck won't start at all and I'm
ready to shove it over a cliff. I have never hated an engine like i do the
4.3 ...It is JUNK and I give up on it!

Автор markjhicks (1 год)
Ed thank you for the professional comment. If someone wants to do it by the
book, they should follow your advise. However, when distributors were
adjustable how were they positioned on the engine? Part of the tune up
process was to set the timing. Not because the distributor moved, it was
because of the extra movement in the timing chain and gear correlation, cam
and distributor gear and distributor bushings. Mark Hicks Wells Vehicle
Electronics

Автор nobleheight (5 лет)
Will an RPM of 650 cause a misfire due to low idle? Is that number low as
far as idle is concerned?q

Автор MrWSCP10 (2 года)
Mark I am going to have a Fuel pressure gauge by tonight, I will post up
the results as soon as I find out. Thank you for your time and helping me

Автор markjhicks (5 лет)
I am not sure where you are going with this...but yea I have a table saw,
planner and joiner that do.

Автор MrWSCP10 (2 года)
2000 Chevrolet Silverado, 4.3L Vortec and a code P0175 and occasional
P0172. 160,000 Service miles including alot of cold and hot starts. Brett
Thank you Mark

Автор nobleheight (5 лет)
Can you run an electric motor on AC without first converting it to DC?

Автор Chris Chiampo (1 год)
Did You Use The Updated MPI Spider on This Repair ? 12500000 Thumbs Up

Автор ed miller (1 год)
to properly adjust the base timing on this you need to do so with a
professional scan tool to reflash your pc with an update which you have to
take to your local dealer to do so. by making any other adjustments like
loggating the base plate you can cause cross fires and all sorts of stuff

Автор markjhicks (5 лет)
Low compression will decrease secondary resistance.

Автор Wells VE (5 лет)
It depends upon how the carbon was formed and the type it is. For example
diamonds are one of the best insulators, where graphite also made of
carbon, is one of the best conductors.

Автор rich jania (2 года)
thanks for your help mark!!!

Автор markjhicks (3 года)
@66bubbaray The first thing I would do is check for spark and fuel
pressure. When you get these results let me know. You can also call me on
our tech line 1-800-558-9770 from 7 am to 7 pm CST. Mark Hicks Wells
Vehicle Electronics

Автор markjhicks (3 года)
@dtrspre No sorry this is the only injector video we have so far. Mark
Hicks Wells Vehicle Electronics

Автор MrWSCP10 (2 года)
I opened up the valley and looked for puddles, found 2 but they are a black
contaminated liquid smelling of oil or fuel and grim mixture. and not in
the immediate valley. The rear most area is really clean where as the front
has carbon covering most of it. What tests can I do while I have this taken
apart? Should I hook up the fuel lines and test the pressure again? Also on
a good note the Injectors have been replaced with the new model that has
sleeves over the hoses and wires at the Inj..

Автор lillskiten1337 (4 года)
@markjhicks I miss sarge XD he was awesome with capital AWESOME!

Автор Andrew Conley (2 года)
This is an excellent video. Good work.

Автор nobleheight (5 лет)
If a spark plug is fouled, will that increase or decrease secondary
resistance?

Автор MrWSCP10 (2 года)
Hello I am hoping I can get a lead on where to start with my Vortec v6 and
a too rich Bank 2 coming up after every code reset. I have been looking
around everywhere and im pretty stuck on this idea of doing what this video
explains. All kinds of black on the tailpipe, runs like doo doo and fuel
seems to vanish. Please help!

Автор markjhicks (2 года)
Excellent news! Happy endings are always a good thing. Ring me anytime,
Take care my friend, Mark Hicks Wells Vehicle Electronics

Автор markjhicks (1 год)
Thank you for the kind words, they mean a lot to us! Mark Hicks Wells
Vehicle Electronics

Автор gloria Ramirez (1 год)
Now that was a good video thanks

Автор markjhicks (5 лет)
No more than .5 volts AC.

Автор markjhicks (2 года)
It is my pleasure to help all i can. Just take a look you will know right
away if something is leaking. In fact if you have a good nose you will
notice a raw fuel smell before you get the intake off.. Mark Hicks Wells
Vehicle Electronics

Автор nobleheight (5 лет)
I know a test light should definitely not be used to test an air bag;
however, I don't understand why a voltmeter is okay while at the same time
an ohmmeter is not okay. What is different about a voltmeter that makes it
okay while a ohmmeter, not okay?

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