I have a 1996 gmc truck 4.3 v6 I replace my spakplugs and wires the coolant temp sensor. check engine light went off ran good for a couple of days now light is back on and truck doesn't want to start than when it does it runs really ruff till it is warmed up. any help would be welcomed

100

Asked by Jun 05, 2014 at 09:45 AM about the 1996 GMC Sierra 1500 C1500 SL Standard Cab LB

Question type: Maintenance & Repair

new plugs wires and coolant temp sensor

21 Answers

100

I have got the computer read at autozone and im getting to codes p0300 and p0420

2 of 2 people found this helpful.
17,155

Changing plugs and wires go hand in hand;not sure where the temp sensor fit in there. Were you running hot and you still are running hot ? Plugs,wires,and sensor ain't gonna cool it down.

2 of 2 people found this helpful.
100

truck doesn't run hot at all.. I replaced the sensor cause the read out I got before said it was bad/

1 of 1 people found this helpful.
17,155

so you had a scan and you have 2 numbers, did you ask the auto zone guy where the #s pointed to?

2 of 2 people found this helpful.
100

i got the print out saying it could be multiple things for each read out.. just trying to get some help from someone who might have had the same problem or have more knowledge. I cant afford to got to a garage cause im poor. so i have to do work myself

1 of 1 people found this helpful.
100

no they didn't help at all they just said what the print out says.. no help from them at all

1 of 1 people found this helpful.
17,155

@timvk - that fix you did a week ago wasn't quite it then. Not very helpful to you if all they do is give you a print-out you don't understand.Should have pointed you towards a misfire in cylinder 1 and a cat problem.

2 of 2 people found this helpful.
100

read out p0300 says ignition system fault-plugs wires or coil; vacuum leak injector fault or high or low fuel pressure..p0420 says catalytic converter defective failure possible due to number 2 3 or 4 engine misfire or running condidtion large vacuum leak seals, piston rings

1 of 1 people found this helpful.
100

p0300 definition says cylinder misfire detected random cylinders p0420 definition says catalytic efficiency low bank 1

1 of 1 people found this helpful.
17,155

so you are pointed in the direct bank 1 + spark,leak.fuel pressure. What you can do in your driveway now depends on what euip. you have access to and what you feel you have a basic understanding of.Hope it's not piston,rings and I'd add valve. --start simple and see if you can detect a vacuum hose loose or all cracked looking.

2 of 2 people found this helpful.
Best Answer Mark helpful
100

where can i find a diagram of the vacuum hoses

1 of 1 people found this helpful.
17,155

Maybe in the engine compartment ( not in mine though) but I have seen some vehicles with it printed. That's where shop manuals are really nice to have. There is another poster on the site that always seems to have a handy web site address for all kinds of stuff (I'm new at this typing stuff ,I never had a Email address until a month ago when I was looking for some info on my car - I'm too tight to pay big bucks for a book;no matter how much I want one) ...Anyway I'll see if he can help with hose locations. In the mean time you might try google for a picture.

1 of 1 people found this helpful.
17,155

I've asked him and I'll get back or he might ( he gets around this computer pretty fast)

1 of 1 people found this helpful.
17,155

Here's what I was told to pass on; but no guarantees because shop manual info is nearly impossible to find for free ..........https://www.alldatadiy.com/

1 of 1 people found this helpful.
100

I have a book but its down at my parents 2 hours away. going to have to wait till Saturday to mess with anymore. I will comment back when I get it and figure something out thanks for your help so far

17,155

good hunting and you should find those codes & related procedures in there too. Just think how much time you could have saved if you kept the shop manual in the vehicle.

1 of 1 people found this helpful.
100

ok vacuum lines are all good no spark at plug wires could it be the ignition coil or mudule

100

update.. have not fixed anything yet.. I left my battery un hooked for about an hour hooked it up turned the key and it fired up on first try.. so I don't know what that means.. don't know if I checked spark wrong is why thought it had no spark or if the reset fixed that... does this mean my mass air flow sensor is bad

100

Any help?????

100

soo it would not start this morning went out just now and it started but it took awhile it would start to turn ove than stop.. than it would start than putter down and die finally got it to stat .. I need help don't have money to take to mechanic so I got to do it myself but don't wanna keep buy parts I don't need

easy way to get your manual for repair find the real name of the book at the store... then search for it with the word torrent after it... use yandex.com to search for that cause google censors.. check out YouTube for cleaning the cat or muffler... much easier when you see someone do the repair then attempt it too. trade secrets not so much a problem in mechanic-in these days, now i just gotta find a good techie that can teach me how to make cell phones work on other provider networks

Your Answer

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 64,913 nationwide Sierra 1500 listings starting at $999.

ZIP:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,460
  • #2
    John Saffrahn
    Reputation
    3,780
  • #3
    Glenn Clingenpeel
    Reputation
    3,470
View All

Related Models For Sale

Used Ford F-150
3,253 Great Deals out of 223,479 listings starting at $1,200
Used Dodge Ram 1500
410 Great Deals out of 11,150 listings starting at $1,495
Used Toyota Tacoma
715 Great Deals out of 45,874 listings starting at $2,500
Used GMC Yukon
603 Great Deals out of 20,706 listings starting at $2,500
Used Chevrolet Tahoe
828 Great Deals out of 42,174 listings starting at $1,987
Used Chevrolet Camaro
455 Great Deals out of 31,823 listings starting at $1,450

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
26,384 listings starting at $23,419
2017 GMC Sierra 1500 For Sale
85 Great Deals out of 10,867 listings starting at $20,369
2016 GMC Sierra 1500 For Sale
157 Great Deals out of 4,094 listings starting at $16,404
2015 GMC Sierra 1500 For Sale
191 Great Deals out of 5,638 listings starting at $14,995
2014 GMC Sierra 1500 For Sale
213 Great Deals out of 4,998 listings starting at $9,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.