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 10, 2014 at 09:33 AM about the 1996 GMC Sierra 1500 C1500 SL Extended Cab LB

Question type: Maintenance & Repair

3 Answers

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

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

or coud it be ignition coil or the module???

Your Answer

Add photo

Related Questions

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 60,427 nationwide Sierra 1500 listings starting at $1,299.

ZIP:

Search GMC Sierra 1500 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,630
#2 John Saffrahn
John Saffrahn
Reputation 3,240
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,900
View All

Related Models For Sale

Used Ford F-150
3,137 Great Deals out of 208,987 listings starting at $1,200
Used Dodge Ram 1500
517 Great Deals out of 13,131 listings starting at $1,800
Used Toyota Tacoma
722 Great Deals out of 32,217 listings starting at $2,750
Used GMC Yukon
571 Great Deals out of 17,253 listings starting at $1,875
Used Chevrolet Tahoe
869 Great Deals out of 28,110 listings starting at $1,700
Used Chevrolet Camaro
433 Great Deals out of 40,831 listings starting at $3,500
Used GMC Sierra 2500
193 listings starting at $4,999

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
22 Great Deals out of 32,863 listings starting at $23,800
2016 GMC Sierra 1500 For Sale
74 Great Deals out of 4,722 listings starting at $18,710
2015 GMC Sierra 1500 For Sale
127 Great Deals out of 4,267 listings starting at $15,888
2014 GMC Sierra 1500 For Sale
171 Great Deals out of 4,281 listings starting at $8,988
2013 GMC Sierra 1500 For Sale
120 Great Deals out of 2,470 listings starting at $9,500