slow cranking engine

[ChanJr.]

I've got another friend with a 1990 Laser AWD that cranks over very slowly (like one rev per second). It's almost like the starter is fighting some sort of friction. What do you think: warped block? It's been bored out to .020 over by someone else. Any suggestions as to the problem is much appreciated.

ChanJr.

 

[ChanJr.]

Pleaz help me!

 

[gsjoeygst]

hey mine does that

 

[GTM]

Originally posted by ChanJr.
Pleaz help me!

I can but try, you have to do the work.

For the moment excluding the engine.

1) bad battery cables:
check the connections at the battery, make sure they are clean and tight. Check the ground connections to the engine and to the body. Check the positive cable (+) at the starter.

2) battery no good:
You need a volt meter and a specific gravity test to determine if it is fully charged.

3) starter no good:
You need to do a current draw test while cranking.

4) selonoid no good:
You will need to know what the current draw is when the selonoid is operated.

Can you do these things?

Cheers,
GTM

 

[ChanJr.]

We're on the ball. ALL belts off (PS, Alt, AC, Timing, balance shaft eliminated so no belt there). Head is off. The number 1 piston has evidence of detonation, but not overheat. I will post a pic soon. Some of the piston material has become FUSED to the head! So, we disconnected the fuel pump, oiled the piston tops and tried to crank it over. Result: slow cranking. So we changed the starter with a spare. Result: slow cranking. Only thing left to do is a full teardown, inspect the rods, and check the crank. Also, one of the aftermarket camshafts is slightly warped. Can all this be due to detonation? Anyone with a similar experience or advice? Thanks in advance.

 

[GTM]

Originally posted by ChanJr.
We're on the ball. ...

Anyone with a similar experience or advice? Thanks in advance.

What the blazes, was this a trick question??

Yes, been there.

But why didn't you include enough information so I didn't waste my time eliminating the more common source which was electrical?? for I feel like I've been set up.

How close were you running to 9.5 compression ratio?? What were compression check readings before disaster?? This was not uncommon on E type Jags which would blow a hole right through the piston as it went through melt down. Needless to say the pistons are history and the block probably is also. You will have to dial indicate or bore gauge check all the cylinders from top to bottom. You will need to surface plate check the block warpage top and bottom (pan gasket surface).

Are there blue spots on the cylinders??

My advice is start all over with another engine. In all probability the head, cams, block are history, you might be able to salvage the crank, rods, flywheel, intake manifold, water pump and oil pump questionable. Balance shafts??

Why is the "friend" not posting here?

Cheers,
GTM

 

[91eagle_tsi_awd]

i had one of my ground cables loose one time,as soon i hooked it back on it was cranking real fast