Toyota Trucks: 88 4Runner Wont Start

Shizza wrote:
 

Compression Check?
 

Possible. A compression check could help reveal that as well (i.e.
cylinders with open valves have no compression, etc).

All sorts of reasons. Start with a compression check.

lycka till!
GTr

"Shizza" <com> wrote in message
news:talkaboutautos.com... 
sputters on ocassion, but not much. I checked the diagnosis system and there
are no codes. The fuel pump is working and I am getting good spark. 

Not sure how you know your fuel pump is "working" - unless you have checked
the pressure (~40 psig).

If you are concerned about the timing belt, you can put a wrench on the
crankshaft bolt and turn it until the timing mark on the pulley assembly is
pointing at 0°. The rotor button on the distributor should then be pointing
dead at a 'tab-like extension' on the mounting face of the distributor. If
it's pointing in the opposite direction, that's okay - turn the crankshaft
another revolution. You will need to remove the fan to get to the
crankshaft - or you could have someone hit the ignition and try to get
lucky. If you use the wrench method, only turn the motor in the clockwise
direction.

If you haven't been changing your timing belt every 80K or so, it's not a
bad bet that it could have broken or jumped. There is no negative
interference with the valves on these motors, so you won't have heard them
hitting the pistons.

Other than that, if you are sure that you are getting good spark and gas
flow, you should check for a serious vacuum leak in the air intake line
followed by checking the air flow meter. There is a fuel pump swith in the
AFM that can be checked as well as other settings, all with an ohmeter.
This is done at the connector.

I can give you the correct readings between the various terminals if you
like.

Luther

"gregory trimper" <net> wrote in message
news:NohUb.10250$news.atl.earthlink.net... 
sputters on ocassion, but not much. I checked the diagnosis system and there
are no codes. The fuel pump is working and I am getting good spark. 

I had a timing chain jump once ('69 Firebird) and the engine spun like a
sewing machine when cranking because there was no longer any compression for
the starter to work against. It was quite odd.

Compression check is good idea if you feel good about spark, fuel, and
induction (including no vacuum leaks). What you describe could be burned
valve(s) which would show up in a compression check. When mine needed a
valve job -- suprisingly -- it wasn't a gradual thing at all. The drop in
performance (it ran, but poorly) happened so suddenly that my mechanic was
certain it was an electrical problem and spent many hours looking for shorts
in the wiring harness before he finally realized he was on the wrong track
completely.

Luther