We"ve got one that has been to the shop 3 times and still isn"t right. When you drive down the road at a decent speed, in third or overdrive, it just falls on it"s face and seems to run at about idle. Then all of a sudden it"s fine. This is a snow plow truck and there are never any problems when plowing. Just when driving job to job it seems. After the second trip to the shop and they were stumped, we changed wires, plugs, coil, cap, etc., fuel filter and more I think. Maybe check fuel pump and pressure? All of the other ones that I"ve had pump problems with just all of a sudden quit. I"m stumped, any ideas? Anyone want to buy a truck that"s plowed 16 years straight!!!!
- Thread starter OliverGuy
- Start date
Allan in NE
Well-known Member
Has anyone put a scanner on it and checked that TPS?
On a '95, that thing has swipped more than a few times. :>)
Allan
On a '95, that thing has swipped more than a few times. :>)
Allan
Anonymous-0
Well-known Member
MAY BE THROTLE POS SENSOR
Mike in Mn.
Member
Most likely the shop has already done this, drive it with a scan tool hooked and check all functions, see what fuel press. is doing. The ones we had gave a lot of problems with that vortec inj. set up but then it was usually just a miss and set a code. Make sure there is a good ground to the computer. Intermittent stuff is hard to find.
Pretty basic stuff on the throttle body injection as yours.Yes a a fuel pressure gauge might lead to pressure dropping off.Thing is,the TB system didn't have a Schrader valve to hook one up,instead,you need to find someone with the correct hardware to tee into the feed line(or buid your own).Running pressure is 9-13 psi.
With that said,a likely culprit would be the fuel pump strainer(sock) at the bottom of tank.Either collecting lots of sediment or worn out and sucking closed under load.
With that said,a likely culprit would be the fuel pump strainer(sock) at the bottom of tank.Either collecting lots of sediment or worn out and sucking closed under load.
Hobo,NC
Well-known Member
- Location
- Sanford, NC
I would scope the pump,,, if the pattern showed a problem I would replace it. If it does not fix it the pump was on its way out anyways. Are install a pressure gauge and go for a ride, you have got to start eliminating things that would lead to this issue..
http://www.syty.net/forums/showthread.php?t=68873&highlight=scope
http://autolabscopediagnostics.com/fuelpump.htm
are Google "scoping a fuel pump" to learn about it.
I have a 94 chev 1/2 ton that was doing that. Had it to Chev garage and they couldn't get it to cut out (figures). Finally took it home and changed two fuses under the dash. There are two fuses that involve throttle bady injection. Put in two new ones and hasn't bothered since and that was last summer. The fuses looked okay but-------.
This may sound elementary, but my'95 does that and i have found the battery cables need a good cleaning and tightening. I have been fooled twice by this truck and both times it was an easy fix. Not saying this is the problem, but the side post terminals have a way of loosening up and causing all sorts of weird problems. JDyer
RandyB(MI)
Well-known Member
Like JDyer at the bottom said , check and clean the "maintenance free" bat terminals. Take then right off and you would be surprised what that plastic covering can hide. My '99 Sub does the same when they get coroded. Sometimes you have to start with the most SIMPLE of things and especially on computer controlled vehicles as any voltage variations can raise havok with everything.
Thanks for all the help. All the battery terminals have been taken apart and cleaned. I'm kind of neurotic about that, we pull all the connections apart there and clean them fall and spring. We have a lot of extra connections at the batteries typically: snowplows, spreaders, etc. We did change the TPS and it hasn't done it again!! Hope that did it. Thanks for all the help. I was stumped on this one. Was at a local garage twice and the chevy dealer once.
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