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Thanks for the info, Think I will pull motor and install a crank
IMO if you're gonna invest that much time and effort, you might as well get a better engine. At the very least find a running parts car you can pull the same exact motor from. They're a dime-a-dozen, and FWIW I seriously doubt the crankshaft is your problem.
What exactly is the vibration like?
Does it happen at higher speeds (MPH) with the clutch pushed in?
Is the engine visibly shaking under the hood at idle?
[quote=sean sean sean sean;18815284]IMO if you're gonna invest that much time and effort, you might as well get a better engine. At the very least find a running parts car you can pull the same exact motor from. They're a dime-a-dozen, and FWIW I seriously doubt the crankshaft is your problem.
What exactly is the vibration like?
Does it happen at higher speeds (MPH) with the clutch pushed in?
Is the engine visibly shaking under the hood at idle?[/
It feels like an internal problem if you are familiar with chevrolet, it is like having a balancer and flywheel from a 350 on a 400 . If that helps the motor ran smooth in car. To your next question yes when reved up as I remember still vibrates Had balancer and flywheel for 85 s-10 on and vibration was real bad, so bought brand new one for 96 firebird, and it smoothed almost half of what it was. Last question no. thanks for imput am still thinking put a crank for s-10 into the motor out of 86 firebird my thoughts are that is where the problem is but still unsure.
Here is a little FYI the motor was working on to get rid of a vibration. Did do a lot of research, and asked a lot of questions to find out the differences. So I finally took the flywheel off the s-10,and had a friend machine the weight off. Amazingly enough when all done there was no vibration, do not know if that was right or not but it worked. Thanks for all the advice.
Old thread but I had a different problem with my 84 S10 2.8.
Drivers side rear cyl was always running LEAN burning the valves and requiring rebuilt heads on driver side.
As a VW engine builder theorized that the problem was the intake manifold causing the LEAN headache.
Early on replaced engine with a quality rebuild...later on repeat issue.
Just my humble opinion.
Any OHV engines are bulletproof and better than Toyota DOHC engines if designed well in first place. GM did screw up a lot in early years, but if you can get the final-year OHV version, they're more durable than Toyota and Honda.
I have owned a couple of 2.8 V6 engines. Don't have much good to say about them. I ended up going through 2 engines in my 88 Camaro (2.8L) because it would pop head gaskets and overheat. Eventually got tired of buying engines and swapped it with a 350. I also had one in a 92 GMC Sonoma. It lasted until about 150k miles and it too popped head gaskets. Same in my uncles 87 S10.
They're underpowered and unreliable. I'd definitely choose something else if possible.
The '88 Celebrity had a 2.8 V6. I often joked that the car would have a running engine and trans and nothing else. Yeah, it was a good motor and was still going strong at over 150K. The '99 Lumina was also good but the intake manifold gasket was its Achilles heel. saving a few dollars on a part and costing several hundred dollars in repairs down the road... GM, for shame. But still at 15 years and over 100K it was still going great, so was the trans. I hoped they salvaged that engine from the wreck.
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