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Problem with dad's truck

 
Old 06-10-2019, 05:10 PM
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Aerovette
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Default Problem with dad's truck

1995 Z71 350 auto 4WD - High miles (about 285k)

It stumbles and runs rough when cold.
Settles down when warm.
After a fair amount of "at temp" driving, it starts to sputter a bit. If you shut it off and immediately restart it, it smooths out. This is repeatable every time is starts to sputter. Turn it off and restart and it's fine for a bit.

TPS has been replaced
Disty has been replaced
Wires have been replaced
Plugs have been replaced

Two different shops have had it and no one can figure it out. No codes.
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Old 06-10-2019, 05:33 PM
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MTPZ06
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Fuel pressure checked at cold start and again when up to temp? It's TBI correct? Could be an injector problem....285K miles is a lot. Original O2 sensors as well?
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Old 06-10-2019, 05:37 PM
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Swany00
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285k? borrowed time with that engine, maybe it's time to get a newerish truck for dad
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Old 06-10-2019, 05:43 PM
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EGR valve?
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Old 06-10-2019, 05:49 PM
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St. Jude Donor '11, '17
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Problem with Dad's truck is that Dad is too cheap to buy a newer one. Should be some reasonable deals on 2 -4 yo trucks. Stay away from any dealers near Lars, Gixxer, Wezzy, koko, etc.
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Old 06-10-2019, 05:50 PM
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Originally Posted by ratflinger View Post
problem with dad's truck is that dad is too cheap to buy a newer one. Should be some reasonable deals on 2 -4 yo trucks. Stay away from any dealers near lars, gixxer, wezzy, koko, etc.
bfm?
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Old 06-10-2019, 05:51 PM
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fly KSpaz out
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Old 06-10-2019, 05:52 PM
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beaversstonehaven
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Fuel filter?
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Old 06-10-2019, 05:54 PM
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Originally Posted by DJ_Critterus View Post
bfm?
Got it in one
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Old 06-10-2019, 05:55 PM
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Originally Posted by beaversstonehaven View Post
Fuel filter?
I'm thinking it's got to be more with the MAF than fuel delivery. IF the filter was clogged, it wouldn't run well period. If it was the pump, it wouldn't run at all the way GM does things.

Sounds like it's not reading the correct air flow at different temps and turning the car on/off to reset everything fixes it temporarily until it sees the same conditions.
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Old 06-10-2019, 05:59 PM
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BLUE1972
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Things that come to mind,

O2 sensor acting up , but not enough to trigger a CEL,
Coil - weak, they act up when hot, run rough when cold as the spark is weak,

There are a few other items, but you need to drive with a data logger to see which item is going out of / close to limits..
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Old 06-10-2019, 06:06 PM
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Originally Posted by Aerovette View Post
1995 Z71 350 auto 4WD - High miles (about 285k)

It stumbles and runs rough when cold.
Settles down when warm.
After a fair amount of "at temp" driving, it starts to sputter a bit. If you shut it off and immediately restart it, it smooths out. This is repeatable every time is starts to sputter. Turn it off and restart and it's fine for a bit.

TPS has been replaced
Disty has been replaced
Wires have been replaced
Plugs have been replaced

Two different shops have had it and no one can figure it out. No codes.
Lazy mass flow sensor.?
O2 sensors lazy?
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Old 06-10-2019, 06:07 PM
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WydGlydJim
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Originally Posted by DJ_Critterus View Post
bfm.FTW?
fixed

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Old 06-10-2019, 06:17 PM
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Originally Posted by Aerovette View Post
Problem with dad's truck
Originally Posted by Aerovette View Post
1995 Z71 350 auto 4WD - High miles (about 285k)
There's your problem. I'd say that truck has given him more than his money's worth. Time to move on.
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Old 06-10-2019, 06:21 PM
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Originally Posted by KarlK View Post
fly KSpaz out
**** would have the whole engine torn apart by now
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Old 06-10-2019, 06:23 PM
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KarlK
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Originally Posted by FourPennyDoug View Post
**** would have the whole engine torn apart by now
and the gaps would be tight!
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Old 06-10-2019, 06:24 PM
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Try this.....
smack the egr valve and run a triple dose of lucas in the gas tank
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Old 06-10-2019, 06:35 PM
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Originally Posted by BLUE1972 View Post
Things that come to mind,

O2 sensor acting up , but not enough to trigger a CEL,
Coil - weak, they act up when hot, run rough when cold as the spark is weak,

There are a few other items, but you need to drive with a data logger to see which item is going out of / close to limits..
Coil is also new. Forgot about that one.

It behaves like a bad vacuum leak when cold...or too rich.

None of that applies to the restart being immediately different.

Also mentioned was MAF, but I'm 99.9% sure it doesn't have one. It's TBI.
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Old 06-10-2019, 06:38 PM
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Originally Posted by TorchRedRocket View Post
There's your problem. I'd say that truck has given him more than his money's worth. Time to move on.
They have another vehicle so it's not hurting them as far as getting around. My dad turns 80 this year and he likes his truck so I want to help keep it running if I can.
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Old 06-10-2019, 06:40 PM
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Originally Posted by Aerovette View Post
They have another vehicle so it's not hurting them as far as getting around. My dad turns 80 this year and he likes his truck so I want to help keep it running if I can.
give him the keys to your Charger
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