323kielr
Newbie
Hi all,
First time posting here, I've done a lot of reading.
I have 2 gmt400's both OBD II
96 Suburban K1500
2000 K3500
Both have their issues that I am still trying to sort out. I have owned each for about 4 years and my family of 6 loves both rigs.
The 96 burb is having some serious issues that I can't track down. I replaced the head gaskets (AND CRACKED CYLINDER HEADS) on it 2 years ago, along with most of the other normal stuff i.e. injectors, fuel pump, timing chain and a slightly larger cam from summit.
I know that I have 2 cylinders in bad shape from when I pulled the heads a while back, (some pitting) but I figured I'd press on, and it has run remarkably well considering.
This has worked great for two years, then last week at the start of a road trip, she got the shakes. Random Multiple cylinder misfire code. It idles awful, and is down on power, I will also note that there is a change in the induction noise, it sounds very "throaty". Due to our schedule we drove it 1,200 miles and replaced some components along the way, nothing helped and the symptoms did not change. It drove better at high RPM, but still noticably down on power. Exhaust smells like gas. Is burning a bit of oil, but I am not sure that is new and likely due to the pitted cylinders.
Replaced cam sensor, crank sensor, coil, plugs (old ones looked great), I left the wires, they all looked great, cleaned the cap and rotor (they also looked great). I tested the ignition control module and it passed. I sprayed the intake with brake clean to try and find a leak and could not, I may have to double check, because that is my suspicion. I also have the typical O2 sensor codes all the way around, but I have always had those on both my rigs and it never seemed to matter. (No cats)
I unfortunately have 1,200 miles under my belt with it in this condition so I have a pretty good feel for the symptoms, I am surprised it survived, my family and I are thankful, but it did not feel good to push it. I feel at a loss, and I am tired of buying parts.
Any insight or help is greatly appreciated.
-Zeke
First time posting here, I've done a lot of reading.
I have 2 gmt400's both OBD II
96 Suburban K1500
2000 K3500
Both have their issues that I am still trying to sort out. I have owned each for about 4 years and my family of 6 loves both rigs.
The 96 burb is having some serious issues that I can't track down. I replaced the head gaskets (AND CRACKED CYLINDER HEADS) on it 2 years ago, along with most of the other normal stuff i.e. injectors, fuel pump, timing chain and a slightly larger cam from summit.
I know that I have 2 cylinders in bad shape from when I pulled the heads a while back, (some pitting) but I figured I'd press on, and it has run remarkably well considering.
This has worked great for two years, then last week at the start of a road trip, she got the shakes. Random Multiple cylinder misfire code. It idles awful, and is down on power, I will also note that there is a change in the induction noise, it sounds very "throaty". Due to our schedule we drove it 1,200 miles and replaced some components along the way, nothing helped and the symptoms did not change. It drove better at high RPM, but still noticably down on power. Exhaust smells like gas. Is burning a bit of oil, but I am not sure that is new and likely due to the pitted cylinders.
Replaced cam sensor, crank sensor, coil, plugs (old ones looked great), I left the wires, they all looked great, cleaned the cap and rotor (they also looked great). I tested the ignition control module and it passed. I sprayed the intake with brake clean to try and find a leak and could not, I may have to double check, because that is my suspicion. I also have the typical O2 sensor codes all the way around, but I have always had those on both my rigs and it never seemed to matter. (No cats)
I unfortunately have 1,200 miles under my belt with it in this condition so I have a pretty good feel for the symptoms, I am surprised it survived, my family and I are thankful, but it did not feel good to push it. I feel at a loss, and I am tired of buying parts.
Any insight or help is greatly appreciated.
-Zeke
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