PKRWUD - Need some professional help

2FastLX · 09-02-2002, 04:37 PM

This is not a Ford question, but I figured since this is such a diverse message board this was the fastest way to get an answer, and I'd appreciate it if this post could at least stay here until resolved.

My friend has a Chevy Z71 pickup with a 350 in it. He said it falls on it's face when you accelerate, unless you baby it. He said it just started all of a sudden.

He's been told it may be the TPS sensor. Could that be the culprit? If so, how do I diagnos this for him? I know how to set the TPS on a Ford. Is it similar?

I assume it is an electrical or fuel problem since it was running fine one minute, then crappy the next. Any other ideas?

Any help you could give me on this matter would be greatly appreciated.

PKRWUD · 09-02-2002, 04:45 PM

Quote:

Originally posted by 2FastLX
PKRWUD - Need some professional help

Okay, You need Roxanne. She can do EVERYTHING!!! She can be reached on her cell at 1-805-4... huh? Oh. Mechanical professional help. Okay.

What year is the truck?

2FastLX · 09-02-2002, 04:47 PM

97 I believe

2FastLX · 09-02-2002, 04:49 PM

Do you have ICQ, MSN messenger, AOL, or Yahoo?

PKRWUD · 09-02-2002, 04:51 PM

Yahoo:

pkrwuds

2FastLX · 09-02-2002, 04:57 PM

I'll download it real quick and see if i can get ahold of you. thanks bro.

PKRWUD · 09-02-2002, 05:11 PM

I'm jumping between a job in the garage and my Mac... What can I help you with?

2FastLX · 09-02-2002, 05:45 PM

I just need to know how to check a TPS on a 97 Z71 Chevy pickup, and where to set the voltage at if a new one needs to be installed.

PKRWUD · 09-02-2002, 05:50 PM

Do it exactly like you would on a Ford. Dark blue wire is the signal wire, and black is the ground. Set it between .50vdc and .85vdc at idle. Check to see that it increases smoothly as you open the throttle. It probably won't, and will need to be replaced. VERY common GM problem.

Take care,
~Chris

srv1 · 09-02-2002, 07:04 PM

Quote:

Originally posted by 2FastLX
This is not a Ford question, but I figured since this is such a diverse message board this was the fastest way to get an answer, and I'd appreciate it if this post could at least stay here until resolved.

My friend has a Chevy Z71 pickup with a 350 in it. He said it falls on it's face when you accelerate, unless you baby it. He said it just started all of a sudden.

He's been told it may be the TPS sensor. Could that be the culprit? If so, how do I diagnos this for him? I know how to set the TPS on a Ford. Is it similar?

I assume it is an electrical or fuel problem since it was running fine one minute, then crappy the next. Any other ideas?

Any help you could give me on this matter would be greatly appreciated.

2Fast, how many miles are on this truck? i will bet you ten to one odds its the fuel pump. i replaced alot of them in the fuel injected chevy trucks. since that is a vortec, if the fuel pressure is up to spec but drops with the key on engine off(priming), pull the upper intake off and look at the fuel lines that go into the intake(yes they are in the intake!). those usually crack a piss fuel in the intake and the truck runs REALLY rich. i am almost positive it is one of the two i mentioned.

let us know. James...

ultraflo · 09-02-2002, 07:33 PM

how do you guys change the fuel pump on the Chevy pickups? I had to do one on a '96 Z71... do you guys drop the tank or remove the bed?

srv1 · 09-02-2002, 09:02 PM

Quote:

Originally posted by ultraflo
how do you guys change the fuel pump on the Chevy pickups? I had to do one on a '96 Z71... do you guys drop the tank or remove the bed?

drop the tank partially and take off the lines then drop it fully. dont forget about the groung wire bolted to the frame.

ultraflo · 09-02-2002, 09:22 PM

I unbolted the bed, disconnected the grounds, and set the front part of it on the tires, then changed the pump... I laughed so hard when I was told to do it this way, but it was really easy afterall.

2FastLX · 09-02-2002, 11:40 PM

Thanks for all the help guys. I'll check his TPS, then do the fuel system checks. I'll let you know as soon as I figure something out.

Oh yeah. I think the truck has around 90k miles on it on it.

fiveohpatrol · 09-03-2002, 12:39 AM

I helped do a couple fuel pumps at a pontiac/GMC truck dealer that i worked at over the summer. What we did was remove all of the bed bolts except for the rear 2 which we loosened up. Then since the truck was on a lift, we put exhaust stands (tall jack stands) up towards the front of the bed, and then lowered the lift. This lowered the truck but tilted the bed way up so we could get to the tank and remove the pump.

Now if you dont have a lift, I dont think it would be nearly that easy

good luck with it Kevin, sorry I'm just wasting a post

09-02-2002, 04:37 PM	#1
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	PKRWUD - Need some professional help This is not a Ford question, but I figured since this is such a diverse message board this was the fastest way to get an answer, and I'd appreciate it if this post could at least stay here until resolved. My friend has a Chevy Z71 pickup with a 350 in it. He said it falls on it's face when you accelerate, unless you baby it. He said it just started all of a sudden. He's been told it may be the TPS sensor. Could that be the culprit? If so, how do I diagnos this for him? I know how to set the TPS on a Ford. Is it similar? I assume it is an electrical or fuel problem since it was running fine one minute, then crappy the next. Any other ideas? Any help you could give me on this matter would be greatly appreciated. __________________ Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels. "The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance." Griggs Racing ICQ# 42269241

09-02-2002, 04:47 PM	#3
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	97 I believe __________________ Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels. "The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance." Griggs Racing ICQ# 42269241

09-02-2002, 04:49 PM	#4
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	Do you have ICQ, MSN messenger, AOL, or Yahoo? __________________ Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels. "The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance." Griggs Racing ICQ# 42269241

09-02-2002, 04:51 PM	#5
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Yahoo: pkrwuds __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

09-02-2002, 04:57 PM	#6
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	I'll download it real quick and see if i can get ahold of you. thanks bro. __________________ Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels. "The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance." Griggs Racing ICQ# 42269241

09-02-2002, 05:11 PM	#7
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	I'm jumping between a job in the garage and my Mac... What can I help you with? __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

09-02-2002, 05:45 PM	#8
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	I just need to know how to check a TPS on a 97 Z71 Chevy pickup, and where to set the voltage at if a new one needs to be installed. __________________ Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels. "The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance." Griggs Racing ICQ# 42269241

09-02-2002, 05:50 PM	#9
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Do it exactly like you would on a Ford. Dark blue wire is the signal wire, and black is the ground. Set it between .50vdc and .85vdc at idle. Check to see that it increases smoothly as you open the throttle. It probably won't, and will need to be replaced. VERY common GM problem. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

09-02-2002, 07:33 PM	#11
ultraflo NX dealer-man Join Date: Sep 1998 Location: Peoria, Illinois Posts: 977	how do you guys change the fuel pump on the Chevy pickups? I had to do one on a '96 Z71... do you guys drop the tank or remove the bed? __________________ RLS Racing! 93 LX 9.20 @ 147mph 03 Mach 1 12.39 @ 116mph

09-02-2002, 09:22 PM	#13
ultraflo NX dealer-man Join Date: Sep 1998 Location: Peoria, Illinois Posts: 977	I unbolted the bed, disconnected the grounds, and set the front part of it on the tires, then changed the pump... I laughed so hard when I was told to do it this way, but it was really easy afterall. __________________ RLS Racing! 93 LX 9.20 @ 147mph 03 Mach 1 12.39 @ 116mph

09-02-2002, 11:40 PM	#14
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	Thanks for all the help guys. I'll check his TPS, then do the fuel system checks. I'll let you know as soon as I figure something out. Oh yeah. I think the truck has around 90k miles on it on it. __________________ Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels. "The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance." Griggs Racing ICQ# 42269241 Last edited by 2FastLX; 09-02-2002 at 11:45 PM..

09-03-2002, 12:39 AM	#15
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	I helped do a couple fuel pumps at a pontiac/GMC truck dealer that i worked at over the summer. What we did was remove all of the bed bolts except for the rear 2 which we loosened up. Then since the truck was on a lift, we put exhaust stands (tall jack stands) up towards the front of the bed, and then lowered the lift. This lowered the truck but tilted the bed way up so we could get to the tank and remove the pump. Now if you dont have a lift, I dont think it would be nearly that easy good luck with it Kevin, sorry I'm just wasting a post __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

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