|
|
94 gmc s 15 jimmy skips when hot
|
|
|
| |
|
|
dixon
New User
Mar 13, 2010, 8:04 PM
Post #1 of 9
(3040 views)
|
94 gmc s 15 jimmy skips when hot
|
Sign In
|
|
1994 Gmc Jimmy
4.3 V6 w/CPI (vin W)
150000 miles
Compression : all 6 around 150psi (all within 5 psi of each other)
Hello there. About 1 month ago i replaced the head gaskets due to loss of compression in 2 cylinders side by side, the engine would lope at idle and stall out at stop lights, etc. Everything went smoothly BUT after test driving it a few time it developed a ?skip?. When the engine is cold it funs perfect but as soon as it gets to normal operating temp say about a mile up the road it starts skiping pretty bad, it uses alot of gas, never stalls out, the more gas i give it the more it skips.
At cruising speeds it sometimes does OK and sometimes continues to skip, at idel it skips.
This i have replaced and/or checked..
Distributor and rotor (new)
Timing with gray black wire disconected
Spark plugs gaped at .o45 (new)
spark plug wires (new)
Fuel filter (new)
Injectors (cleaned)
Coil (new)
Vacume lines (some replaced)
Pcv (new)
Possibiltys:
When installing the distributor with #1 at TDC, the rotor landed at say... 7-8 o'clock. the clymer manual i used showed about 4-5 o'clock. could this be causeing a problem?
I AM VERY CLOSE TO SETTING THIS THING ON FIRE. PLEASE HELP!
|
|
| |
|
|
re-tired
Veteran
/ Moderator
Mar 14, 2010, 12:05 AM
Post #2 of 9
(3033 views)
|
|
Re: 94 gmc s 15 jimmy skips when hot
|
Sign In
|
|
First thing that comes to mind ..did you have head checked for warpage by machine shop. Second thing ,,, it makes no difference what clock position the rotor ends up. So long as the cap post it ends up pointing at has the #1 plug wire on it with the remaining wires put on in the firing order in direction of rotation . Also , wires must be able to move enough to set timing and dist turn without interference to set timing as well.
LIFE'S SHORT GO FISH
|
|
| |
|
|
dixon
New User
Mar 14, 2010, 7:59 AM
Post #3 of 9
(3026 views)
|
|
Re: 94 gmc s 15 jimmy skips when hot
|
Sign In
|
|
i checked head with feeler guage and it was all within tolerance.
so i can drop the distributor down wherever?
or i need to drop it in so that it sits ON the peg marked (1)? or just before it?
Thank you
|
|
| |
|
|
steve01832
Veteran
Mar 16, 2010, 4:53 PM
Post #4 of 9
(2999 views)
|
|
Re: 94 gmc s 15 jimmy skips when hot
|
Sign In
|
|
Another consideration is the fuel injector on this vehicle. It is prone to having the poppet valves go south. If you are using excessive fuel, sometimes black smoke present, you may want to put a fuel pressure guage on this.
A sure way to know if the injector is bad is turn key on engine off. Fuel pressure guage will be in range of 60 psi. Then if the guage drops way down quickly followed by an extended crank time, the injector is bad. I have replaced many injectors on 4.3 liter engines and there are plenty of TSB's on them.
Steve
|
|
| |
|
|
Loren Champlain Sr
Veteran
/ Moderator
Mar 16, 2010, 5:24 PM
Post #5 of 9
(2997 views)
|
|
Re: 94 gmc s 15 jimmy skips when hot
|
Sign In
|
|
>>prone to having the poppet valves go south<<
Probably depends whether you are a yank or a rebel....Here, in WA, the poppet valves go north. 
Loren
SW Washington
|
|
| |
|
|
steve01832
Veteran
Mar 16, 2010, 5:32 PM
Post #6 of 9
(2995 views)
|
|
Re: 94 gmc s 15 jimmy skips when hot
|
Sign In
|
|
Where, to Canada?
Steve
|
|
| |
|
|
Loren Champlain Sr
Veteran
/ Moderator
Mar 16, 2010, 5:33 PM
Post #7 of 9
(2995 views)
|
|
Re: 94 gmc s 15 jimmy skips when hot
|
Sign In
|
|
dixon; The others addressed the fuel issue. I'll concentrate on the distributor. The way that I've always done it. Remove #1 spark plug. Disconnect coil so engine can't start. Have a helper 'bump' the engine over while you hold a finger to the #1 cylinder hole. Once you feel a 'push' of compression, stop. By hand, rotate the engine until the timing mark points to TDC. That will be top dead center on the compression stroke. Identify #1 spark plug wire on the distributor cap. Remove the cap and be certain that the rotor is pointing directly at where you determined #1 spark plug wire to be. If not right, remove the distributor and turn the rotor so that when the distributor drops into place and is fully seated, the rotor is still where it should be. You may not hit it 'right' the first couple of tries. You may have to drop it in, what seems like, a tooth too soon, as it will want to turn as it seats all of the way. Once you are sure you are right, turn the engine over a few times and then bring it up on TDC (compression stroke) and recheck.
Loren
SW Washington
|
|
| |
|
|
Loren Champlain Sr
Veteran
/ Moderator
Mar 16, 2010, 6:26 PM
Post #8 of 9
(2992 views)
|
|
Re: 94 gmc s 15 jimmy skips when hot
|
Sign In
|
|
Yes, Canada....We send them to Dan.
Loren
SW Washington
|
|
| |
|
|
dixon
New User
Mar 18, 2010, 1:48 PM
Post #9 of 9
(2985 views)
|
|
Re: 94 gmc s 15 jimmy skips when hot
|
Sign In
|
|
thankyou for the distributor instructions, that is exactly what ive done. as far as the poppet issue. there is a pressure fitting at the back of the plunium or whatever its called. do i hook up there? and would this cause to engine to run good cold but not hot? im thinking the timing is advanced when warming up so it will burn the extra fuel??? not to sure. please educate me.
Thanks to all
|
|
| |
|
Auto Repair Home
SEARCH
WHO'S 
LOG 
mdma pills for sale : WhatsApp +33758633852
Drive Shaft Repair
2006 Toyoto Camry XLE Driver Side Electric Window Trouble
Grounding Cable, 2017 Jeep Renegade Trailhawk
equipment
