timing? What else could it be?
#61
CF Veteran
Joined: Nov 2008
Posts: 2,473
Likes: 9
From: Paso Robles Ca
Year: 1991
Model: Cherokee
Engine: 4.0
step #1
remove all spark plugs
step #2
set the crank to TDC on the balancer
step #3
wrap some duct tape around the blower tip so it fits tight in the #1 spark plug hole and try to pressurize the cylinder
if it just bows in with no back pressure turn the crank one revolution to TDC again the try to pressures the cylinder again
if you get pressure you are on the compression stroke and the chain has not slipped
now step #4 reset distributor to #1 and check firring order
remove all spark plugs
step #2
set the crank to TDC on the balancer
step #3
wrap some duct tape around the blower tip so it fits tight in the #1 spark plug hole and try to pressurize the cylinder
if it just bows in with no back pressure turn the crank one revolution to TDC again the try to pressures the cylinder again
if you get pressure you are on the compression stroke and the chain has not slipped
now step #4 reset distributor to #1 and check firring order
#63
If you get a chance, pull the dist out and inspect the teeth on the gear on both the distributor and the gear thats on the camshaft. I had a similar issue, kept replacing CPS, and other misc sensors, come to find out the gear on the cam was worn, and this was wearing down the teeth on the dist. In turn it got to a point where it would not start at all, or if it did, it would pop and backfire cuz it was throwing the timing off.
#64
Thread Starter
Junior Member
Joined: Aug 2009
Posts: 65
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From: Peach Bottom, PA
Year: 88
Model: Cherokee
Engine: 4.0
that is what you get with a 180 off distributor
do you have air compressor and a blower tip???
If you get a chance, pull the dist out and inspect the teeth on the gear on both the distributor and the gear thats on the camshaft. I had a similar issue, kept replacing CPS, and other misc sensors, come to find out the gear on the cam was worn, and this was wearing down the teeth on the dist. In turn it got to a point where it would not start at all, or if it did, it would pop and backfire cuz it was throwing the timing off.
#65
I think I agree with you on the chain and the timing to a certain extent too, Mike37 ... was not suggesting she replace the timing components either, just offering tips in case they do anyway ... a peek at the marks with a timing light will show ... there will be no mark to be seen under the strobe if she is 180 out ... I'm thinkin that she may be less than 180 out too but still way out ... since it does seem to run to a certain extent and I assume stay running ... don't think it could run if it were exactly 180 out. There was some confusion early on their part regarding what was the compression stroke as well ... but I thought we had that issue taken care of .... re read the thread and see if you agree, Mike37.. she probably needs some time off before melting down ... what a PITA ... hang tuff, Karen7
#66
CF Veteran
Joined: Nov 2008
Posts: 2,473
Likes: 9
From: Paso Robles Ca
Year: 1991
Model: Cherokee
Engine: 4.0
I think I agree with you on the chain and the timing to a certain extent too, Mike37 ... was not suggesting she replace the timing components either, just offering tips in case they do anyway ... a peek at the marks with a timing light will show ... there will be no mark to be seen under the strobe if she is 180 out ... I'm thinkin that she may be less than 180 out too but still way out ... since it does seem to run to a certain extent and I assume stay running ... don't think it could run if it were exactly 180 out. There was some confusion early on their part regarding what was the compression stroke as well ... but I thought we had that issue taken care of .... re read the thread and see if you agree, Mike37.. she probably needs some time off before melting down ... what a PITA ... hang tuff, Karen7
I wish I could get a look at it in person
its hard to trouble shoot on a forum with something like this cus there are so many variables
#67
Thread Starter
Junior Member
Joined: Aug 2009
Posts: 65
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From: Peach Bottom, PA
Year: 88
Model: Cherokee
Engine: 4.0
I am off the case today, lol. my kids started school so I am spending the evening filling out papers and just being mom. I refuse to get greasy today.
Another cousin of mine is coming up to take a look at it, he wants to see if the valves are too tight. Also they gonna check the timing chain cuz we got another puller. We'll see how that goes.
Another cousin of mine is coming up to take a look at it, he wants to see if the valves are too tight. Also they gonna check the timing chain cuz we got another puller. We'll see how that goes.
#68
CF Veteran
Joined: Nov 2008
Posts: 2,473
Likes: 9
From: Paso Robles Ca
Year: 1991
Model: Cherokee
Engine: 4.0
I am off the case today, lol. my kids started school so I am spending the evening filling out papers and just being mom. I refuse to get greasy today.
Another cousin of mine is coming up to take a look at it, he wants to see if the valves are too tight. Also they gonna check the timing chain cuz we got another puller. We'll see how that goes.
Another cousin of mine is coming up to take a look at it, he wants to see if the valves are too tight. Also they gonna check the timing chain cuz we got another puller. We'll see how that goes.
and easy way to see if you have a chain problem is to remove the dis cap
and turn the crank with a wrench back and forth if you rotate the crank more than a 1/8 of an inch and the rotor dos not turn you have to much slop in the chain
#69
I wish I could get a look at it in person
its hard to trouble shoot on a forum with something like this cus there are so many variables
its hard to trouble shoot on a forum with something like this cus there are so many variables
Have fun bein' a mom ... I'd rather twist bolts than ears ..... it's much easier than parenting ... LOL ... have a great day off:+)
#70
Thread Starter
Junior Member
Joined: Aug 2009
Posts: 65
Likes: 0
From: Peach Bottom, PA
Year: 88
Model: Cherokee
Engine: 4.0
The timing chain is perfectly in time along with dist, but its still running like crap. My cousins brother in law is a mechanic so he's gonna ask him and see if he can come look at it and give some advice.
#71
at this point ...
the more the merrier ...
how do you know for certain that it is perfectly in time, may I be so bold as to inquire? I can't recall you having said what method was used to determine or verify that, K, or did you and I CRS ...lol ?
The timing chain is perfectly in time along with dist, but its still running like crap. My cousins brother in law is a mechanic so he's gonna ask him and see if he can come look at it and give some advice.
Today 04:20 PM
Today 04:20 PM
#72
Thread Starter
Junior Member
Joined: Aug 2009
Posts: 65
Likes: 0
From: Peach Bottom, PA
Year: 88
Model: Cherokee
Engine: 4.0
They went by the Haynes manual and checking timing belt by lining up marks and counting pins. Checked dist on time as per the book and your instructions on how to get TDC. Everyone seem to time the dist he same.
#73
checking timing belt by lining up marks and counting pins
#75
Mike37
The pin count is the number of 'link pins' between certain points on the chain while measuring between the dots on the sprockets when one sprocket is at the 1 o'clock position and the other is at the 3 o'clock .. confused yet? ... lol ... used for verifiying correct installation OR could show up a chain slip as well if the pin count is wrong. Not really applicable in this exercise, Mike, IMHO.
Don't you think they should LOOK with a timing light ?? .. Holy Moley, how hard could that be? ... maybe no one (but me) even owns one anymore ... lol. Wouldn't be surprised ... very little use for 'em in today's modern computer controlled motors.
Don't you think they should LOOK with a timing light ?? .. Holy Moley, how hard could that be? ... maybe no one (but me) even owns one anymore ... lol. Wouldn't be surprised ... very little use for 'em in today's modern computer controlled motors.
Last edited by vistacruiser; 08-31-2009 at 07:15 PM.