95 yukon sputtering mising

[travo87]

So my yukon 95 obd1 is acting like it is missing when accelerated like when I floor it it misses but it has new spark plugs wires distributor battery all that if ya have dealt with this please let me know

 

[OR VietVet]

Crankshaft position sensor? What color is the spark? Weak orange color or strong blue color? May have weak coil output? What is the fuel pressure?

 

[B-train]

Are you sure thr firing order is correct:
18436572 should be for that era I believe. A misplaced wire can act like that. Also, did you set the timing after replacing the cap and rotor with a timing light?

 

[Hoesgottaeat2]

Throwing a CEL?

 

[travo87]

Crankshaft position sensor? What color is the spark? Weak orange color or strong blue color? May have weak coil output? What is the fuel pressure?

No crankshaft position sensor. It's a 95. Spark is good new plugs, wires, coil, and distributor. Fuel pressure??? Don't know.

 

[OR VietVet]

No crankshaft position sensor. It's a 95. Spark is good new plugs, wires, coil, and distributor. Fuel pressure??? Don't know.

My apologizes. When I checked, https://www.rockauto.com/en/moreinfo.php?pk=2419754&cc=1166419&pt=7196&jsn=883, I did see a crankshaft position sensor listed for a 1995 Yukon, with a 5.7 engine. The listing at RA could be wrong but that is what I went by.

Maybe I got mixed up with the run on sentence, with no periods or punctuation. I am old. It confuses me.

 

[drakon543]

those tbi had a few issues to look at that could also be the culprit. while its running at idle have your while pan air cleaner assembly removed and physically look at the injectors spray pattern. it should be a nice clean cone. slowly open the throttle by hand and continue to watch the spray pattern to make sure it stays the same but the pulse speeds up. also look real close that you dont see drips of extra fuel at anytime during this visual test. also make sure you dont see any fuel coming out of the back of the tbi. if you see any of these issues its due for a tbi rebuild. the seals around the injectors can fail causing extra fuel to get dumped in especially at wot. if has been touched previously there's several things that can have been done incorrectly so be on the lookout for that. in the back half of the tbi is the fuel regulator. its just a spring operated diaphragm that can fail may not be visibly apparently besides the cone pattern gets crappy as you open the throttle blades.

 

[B-train]

those tbi had a few issues to look at that could also be the culprit. while its running at idle have your while pan air cleaner assembly removed and physically look at the injectors spray pattern. it should be a nice clean cone. slowly open the throttle by hand and continue to watch the spray pattern to make sure it stays the same but the pulse speeds up. also look real close that you dont see drips of extra fuel at anytime during this visual test. also make sure you dont see any fuel coming out of the back of the tbi. if you see any of these issues its due for a tbi rebuild. the seals around the injectors can fail causing extra fuel to get dumped in especially at wot. if has been touched previously there's several things that can have been done incorrectly so be on the lookout for that. in the back half of the tbi is the fuel regulator. its just a spring operated diaphragm that can fail may not be visibly apparently besides the cone pattern gets crappy as you open the throttle blades.

Also to note, those TBI units can have the gasket under the unit get dry rotted and cracked up. They then suck air below the spray pattern.

 

[exp500]

Since it happens at WOT, most likely is FPR kit needed. As Drakon mentioned. Timing is also a little suspect as these do not like over advanced more than about 2 degrees depending on other things. After replacing FPR, a relearn of IAC is warrented.

 

[OR VietVet]

More Information for ACDELCO 2172900

More Information for WIX 33481

More Information for ACDELCO 2172286

More Information for DELPHI FE0115

https://www.rockauto.com/en/moreinfo.php?pk=1112676&cc=1166419&pt=10147&jsn=938 4 door

More Information for DELPHI CV10033

Just in case.

 

[travo87]

OK well I found the culprit. All along the issue with the sputtering and misfiring thing, was all a stuck open or closed egr valve. But I also did a rebuild kit on my tbi alo g with some new vacuum lines, and new fuel lines.

 

[B-train]

Thanks for sharing your findings. Depending on if you have emissions testing or not, I'd probably just throw the EGR out and cap it off.

It's been years since I've worked on that generation, but I don't recall a tattle tail for that system if disabled.

 

[OR VietVet]

I should have thought of that EGR. A boss of mine had a 95 Suburban do the same thing. I replaced for him and problem solved. Good call and repair.

 

[travo87]

Deleting the egr is that possible even with the egr solenoid.

 

[travo87]

OK so real quick, what would make the rpm needle bounce radically back and forth when accelerating but at idle purrs like kitten curious about this one thanks yall foe all the great info advice

 

[exp500]

OK so real quick, what would make the rpm needle bounce radically back and forth when accelerating but at idle purrs like kitten curious about this one thanks yall foe all the great info advice

Bad Crank Sensor.

 

[travo87]

Bad Crank Sensor.

It's a 95 it doesn't have a crank shaft position sensor

 

[exp500]

It's a 95 it doesn't have a crank shaft position sensor

it is inside distributor. Could be bad wiring or grounds associated with that.

 

[travo87]

OK so everyone who has been following along on here with me on this yukon missing sputtering well now it won't start don't know why can't figure it out so I wnr ahead and started tearing it down from the intake and so forth. Well I got the intake off and I come to find out why my egr wasn't working the ports were clogged Hella bad like solid exhaust sut I had to beat it with a picks there is another colperite will.post more throughout the rebuild

 

[exp500]

Inspect cam while intake off. Obviosly your "miss" wasn't effected by a plugged EGR. I would check electrical first, then fuel. Any codes set prior to disassembly?