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Truck ran bad,spuddered & died,towed into my shop.installed test pipe in place on cat,truck started up,ran 4 minutes,died,cam sensor code
came up,replace sensor,truck started,cleared codes,truck died.
engine running fuel pressure 30psi,no codes,died.
replace crank sensor,truck starts,died in 4 min again.
tap on pcm while truck is running,no clitches in scan data.
replaced tp sensor,truck starts,4 min then dies.fuel pressure good,
several times came back with po320 in memory.
wiggled wires at different points,no change while running-died in 4
min again.
The fuel pressure sounds too low. Is it multi-port injection? Check the fuel pressure against your specs for the car and engine. MPFI systems usually require 40-50 psi.
I would want to know what the fuel pressure is on the rail. Sounds like the fuel pressure regulator has failed, or the return line to the tank is blocked.
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Most reputable muffler shops will have a flow meter that they can test the back pressure at the cat. This will tell you if it is clogged up or not. I would say that with you needing an O2 sensor that maybe the engine was running rich and clogged up the cat.
the items that cause changes in the air/fuel mixture are
Heated oxygen sensor( in the exhaust manifolds before the cat converters
Map sensor
Baro sensor
Maf/vaf sensors
intake leaks ( vent on canister , vacuum hoses etc )
failed cat converter blocking exhaust system
The first place I would look at is the heated oxygen sensor(HO2S) as it has rather delicate wires that regularly fail and that causes erratic messages to the ECM
If the cat is clogged, blocking exhaust flow, the car may start normally, and may run fine while the engine is cold. Within a few mins as engine warms it will start to bog down and die when you try to acellerate, even a little. May even die out if you give it gas, while it may idle just fine.
This has been my experice in 2 different cars of different types over the years.
well it is located right below your motor
there are 2 places you can get the pipe from 1 is scrap or salvage the other is the dealer
it is likely you will havew to buy a new pipe from the dealer as the ones in the salvage yard are usualy crushed by machinery picking the cars up and them being droped in the mud
the only othere option is to have a muffler shop build you a dual exhaust witch might be cheeper in the long run and also allow you to get better fuel econamy and more power from the engine for towing if required take a look at the options and get a few quotes from local shops
It sounds like the catyletic converter might be plugged. I had a Chevy Suburban a while back that did the same thing, no check engine light. To figure it out, I took the exhaust pipes lose at the manifolds. It started right up and ran fine but noisy, there are aftermarket converters available from most auto parts stores.
Check the exhaust compression. Remove the O2 sensors before the cataylic converts and see if it improves. If it does that means your cats are cloged and need to be replaced.
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