4.3 LTR VORTEC V6 engine runs rough when cold; smooths out when warm but then service engine light comes on and car will run for about another 10 minutes and will start stalling.
You need to have the codes checked to know what direction to start repairs,Autozone does this for free
I have a 1994 gmc truck that I changed motor and transmission in I took it out of a 90 chevy and the motor will start up run but once you give it gas it dies anyone have any pointers
I have a 95 GMC Jimmy 4.3 V-6 Vortex 4x4 2-Door and everything is new on the motor but when its cold outside it runs good but when it gets warm it runs like **** it try to flood it self out with gas and I have done everything to it like seeing if it would pass any codes and it didt so I have take off my Exhaust and see if it was plugged up and it was not so there is birthing in there so I run 2-More tests on it I take off the EGR and see what it can do so it runs good but 2-Hours later it was tuning like **** again so the 3-Test I pulled out the o2 Sensor and did a test on the Exhaust to see how much back pressure is there and it said 200 pounds of back pressure and now I don't know how that can be posably so I started thinking.... Someone said about looking at the Exhaust Manafold for a Flipper on the inside so I did and some times they stick on you so if you can take it out of the Exhaust Manafold do it and if you what to know more call 573-315-8272 Aaron.... It runs damn good now LOL...
I have a 1993 GMC Jimmy. 4.3 Vortec motor. Tunr key to start some times it will start right up. some times it turns over a long time before it starts
I have the same exact problem all of a sudden. 1994 GMC Jimmy engine runs rough when cold; smooths out when warm". I went to Autozone and they said they couldn't do it because the check engine light isn't on. When I 1st start the truck it runs rough, even stalls. TBI makes sounds like it's starving for air. After about 2 min. of revving idle smooths out & air starving sound goes away. Timing is good at this point. Then after 10 min. of driving starts dieing again. 505-450-5621 David. Your help is appreciated. Luv 2 learn.
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