1995 Jimmy

[dreamcatcher_79]

I am desperately hoping someone can help us. Our 1995 Jimmy wil start sometimes and other times will flood itself and not start. We changed fuel filter and seemed to help but now back to same old things. Can't trust it leaves us stranded sometimes. Any help will be good.,

[ZL1power69]

check the upper manifold for washing. this is caused buy fuel leaking from the CPI/fuel regulator or the fuel lines/"nut kit". this could be ur problem. pull the vortech cover off the manifold and remove the valve on top of the manifold. look down inside and look for washing. If u find washing(clean areas where as the entire thing should be dirty), the cpi and/or nut kit is probably to blame.

also check ur O2 sensors. if these are bad, they may tell the ECM to flood the engine.

is ur check engine light on by any chance?

[drdd]

yep, search this forum and the Chevy Blazer forum (same engine) for:

washing
nut kit
cpi

and you will see ... very common problem for 95s

Originally Posted by dreamcatcher_79

I am desperately hoping someone can help us. Our 1995 Jimmy wil start sometimes and other times will flood itself and not start. We changed fuel filter and seemed to help but now back to same old things. Can't trust it leaves us stranded sometimes. Any help will be good.,

[dreamcatcher_79]

no engine light is on
we had spider injector changed couple years ago but haven't had 02 sensors checked..can we do that ourselves and if so where are they located
will do other things you suggested thanks...seems to be running fine today but did hestitate on hills and had to give more gas almost like it was starving for gas or running out but had lots of fuel..
thanks again for any help

[ZL1power69]

Originally Posted by dreamcatcher_79

no engine light is on
we had spider injector changed couple years ago but haven't had 02 sensors checked..can we do that ourselves and if so where are they located
will do other things you suggested thanks...seems to be running fine today but did hestitate on hills and had to give more gas almost like it was starving for gas or running out but had lots of fuel..
thanks again for any help

if the check engine light is on, use a scanner (can be rented at auto zone)to read the codes. The O2 sensors are in the exhaust pipe, one before and after the cat. also the cpi injectors last about 5-7 years. when u had the cpi replaced, did u also replace the nut kit. If not, that can also leak (as i found out, both my cpi and nut kit were bad). it had no power going up hills with those two leaking. if u find these to be the problem, replace them imediately and change the oil, as gas in the oil will cause internal damage to the engine. the O2 sensors will be about 40 bucks each if u find them to be bad.

[rlith]

Zl1power69 is right, also not just because you replaced it a couple of years ago doesn't mean it didn't go bad again, while they should easily last 100k I've seen plenty of them blow out in less than a year (mine did ).... Ultimately it's best to pull the upper plenum and check for washing. As ZL1 said though it could also be the nut kit. As a rule of thumb you should replace the nut kit when you replace the CPI.

[ZL1power69]

Originally Posted by rlith

Zl1power69 is right, also not just because you replaced it a couple of years ago doesn't mean it didn't go bad again, while they should easily last 100k I've seen plenty of them blow out in less than a year (mine did ).... Ultimately it's best to pull the upper plenum and check for washing. As ZL1 said though it could also be the nut kit. As a rule of thumb you should replace the nut kit when you replace the CPI.

pulling the upper plenum takes about 5-10 minutes with a 10mm socket. as rlith said, just because it was replaced a couple years back does not mean it did not go bad. i know someone else with a 95 blazer with about 150,000 on it and they have never replaced the cpi. i know of another person with a 95 jimmy with 77,000 miles that has had 2 cpi replacements. as for my truck, the cpi was bad and the nut kit had a hole in it. again if these are bad get them replaced right away. the cpi unit is about $295 and the nut kit is $55. u will need a new upper intake gasket which is about $11.50. i posted all this info on this thread below.
http://www.automotiveforums.com/vbul...d.php?t=455035

[dreamcatcher_79]

thanks for advice...light isn't on...but will check out other ideas..have to wait now until end of Oct. nut appreciate any info anyone adds...haven't had it scoped yet pr tpwed tp tpwn but heard if truck is not acting up things won't show up...biggest concern is it will quit and leave me stranded.. we love the truck but not dependable..one day starts next it doesn't...

thanks again,,,

[rlith]

Originally Posted by dreamcatcher_79

thanks for advice...light isn't on...but will check out other ideas..have to wait now until end of Oct. nut appreciate any info anyone adds...haven't had it scoped yet pr tpwed tp tpwn but heard if truck is not acting up things won't show up...biggest concern is it will quit and leave me stranded.. we love the truck but not dependable..one day starts next it doesn't...

thanks again,,,

Well we have to eliminate things... As said the CPI and/or nut kit could be bad... Have you also done a fuel pressure test?

[dreamcatcher_79]

Just wondering if it could have anything to do with the VCM. Got told it could be it or bad fuel pump.. Help

[rlith]

Originally Posted by dreamcatcher_79

Just wondering if it could have anything to do with the VCM. Got told it could be it or bad fuel pump.. Help

Did you do the pressure test? Did you pull the upper plenum to check for washing?