AyWoSch Motors
OBS Enthusiast
Hi all, my first and biggest question...
My daily driver 92 Suburban K1500 recently developed some pretty bad issues. I would assume its transmission related, but not sure.
Here are the symptoms:
It started loosing power about a week ago, started having a harder and harder time getting going and getting up to speed. Then I started having a really hard time getting up hills at any speed.
It seemed like it was bogging really bad, like the way a carburetorated truck would be like if it was running super rich or if a float got stuck wide open. And when I let off the gas it would speed up a little before slowing down.
It eventually got worse and worse, so bad that it wouldnt go much over 30mph. But in park it runs great. Real snappy throttle, sounds healthy, about 60lbs of oil pressure, but in gear is where all the trouble starts.
So I checked the ECM codes, threw a code for the EGR system failure, a Electronic spark control module fault, and the Vehicle speed sensor. I replaced the ESC module and the EGR valve and it didn't change a thing. And the speed sensor has been throwing a code ever since I got it.
Then I thought I'd check the timing, because I'd never messed with it since I got it. I checked the timing, and it was really far off from the mark. Then I unplugged the plug on the firewall and it almost stopped running, was really rough. It was so far retarded that I couldn't even see the mark, so I adjusted the base timing without the electronic advance. I advanced it until I could see the mark, and it seemed to run better. Then I tried to advance it until it was near 0°, but it would start running really bad, so I retarded it again until it was running smoother. Plugged the plug back in. After I did that, i took it for a ride, and it seemed to have more power, but still not back the way it was. So I don't know if its engine or not now.
But then I figured I'd drive it home and test it a bit, and it started making horrible noises. Sounds like a diesel when it's running now. When it's in park or neutral, it doesnt make any noise, but when it's in drive or reverse it makes the noise. If you hold the brake and press the gas a little when in drive, its really bad. Sounds like a gravely metal rattling sound like a powerstork diesel at idle. And driving home going up a small incline that I usually do 65mph up, it wouldn't do over 30mph up.
Also, now when I start it up, sometimes it runs no problem but other times it dies 2 seconds later. But then even when it's running fine in park, you put it in gear, and it instantly dies. Only way to get it ti move right now, is to start it, rev it instantly to keep it running, slip it in the neutral quick, then keep the RPMs up and drop it in gear real fast, and sometimes itll stay running.
But the trans is making horible noises.
What would you think it is?
Is there a part I could change or something I could fix, or am I in for a new trans?
I'm really stumped. My first guess would be the transmission. Maybe the pump have up, maybe the torque converter is full of sludge, or something finally wore out enough to break.
When I first got the truck, I changed the trans fluid, trans filter, and gasket. The fluid is still bright red and full, doesnt smell burnt.
TBI 350ci small block, with 4L60E, both original to the truck, 302k miles.
Please help, I need my Burb back soon.
My daily driver 92 Suburban K1500 recently developed some pretty bad issues. I would assume its transmission related, but not sure.
Here are the symptoms:
It started loosing power about a week ago, started having a harder and harder time getting going and getting up to speed. Then I started having a really hard time getting up hills at any speed.
It seemed like it was bogging really bad, like the way a carburetorated truck would be like if it was running super rich or if a float got stuck wide open. And when I let off the gas it would speed up a little before slowing down.
It eventually got worse and worse, so bad that it wouldnt go much over 30mph. But in park it runs great. Real snappy throttle, sounds healthy, about 60lbs of oil pressure, but in gear is where all the trouble starts.
So I checked the ECM codes, threw a code for the EGR system failure, a Electronic spark control module fault, and the Vehicle speed sensor. I replaced the ESC module and the EGR valve and it didn't change a thing. And the speed sensor has been throwing a code ever since I got it.
Then I thought I'd check the timing, because I'd never messed with it since I got it. I checked the timing, and it was really far off from the mark. Then I unplugged the plug on the firewall and it almost stopped running, was really rough. It was so far retarded that I couldn't even see the mark, so I adjusted the base timing without the electronic advance. I advanced it until I could see the mark, and it seemed to run better. Then I tried to advance it until it was near 0°, but it would start running really bad, so I retarded it again until it was running smoother. Plugged the plug back in. After I did that, i took it for a ride, and it seemed to have more power, but still not back the way it was. So I don't know if its engine or not now.
But then I figured I'd drive it home and test it a bit, and it started making horrible noises. Sounds like a diesel when it's running now. When it's in park or neutral, it doesnt make any noise, but when it's in drive or reverse it makes the noise. If you hold the brake and press the gas a little when in drive, its really bad. Sounds like a gravely metal rattling sound like a powerstork diesel at idle. And driving home going up a small incline that I usually do 65mph up, it wouldn't do over 30mph up.
Also, now when I start it up, sometimes it runs no problem but other times it dies 2 seconds later. But then even when it's running fine in park, you put it in gear, and it instantly dies. Only way to get it ti move right now, is to start it, rev it instantly to keep it running, slip it in the neutral quick, then keep the RPMs up and drop it in gear real fast, and sometimes itll stay running.
But the trans is making horible noises.
What would you think it is?
Is there a part I could change or something I could fix, or am I in for a new trans?
I'm really stumped. My first guess would be the transmission. Maybe the pump have up, maybe the torque converter is full of sludge, or something finally wore out enough to break.
When I first got the truck, I changed the trans fluid, trans filter, and gasket. The fluid is still bright red and full, doesnt smell burnt.
TBI 350ci small block, with 4L60E, both original to the truck, 302k miles.
Please help, I need my Burb back soon.