wiring diagram 1987 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jay6891 · 08-27-2003, 04:26 PM

Looking for a wiring diagram for a 1/2 to 87 chevy truck. Anybody know where to find one? Working on a buddy truck and he is pulling all emission stuff. Trying to help but with 2 temp sender and 2 oil senders, good god I love my 68. thanks for any help or suggestions.

**swervin ervin** · 08-27-2003, 04:42 PM

The temp sensor in the intake is for the computer. The one in the drivers head is for the gauge or light.

The oil pressure sender above the oil filter is for the gauge. The one at the distributor is a switch for the fuel pump.

Is he switching over to a carb?

87 STEPPER · 08-27-2003, 04:43 PM

UHHH!

Temp & Oil sending unit's dont have any thing to do with emissions.

But the truck will not run with out this info going to the ECM.

**swervin ervin** · 08-27-2003, 04:43 PM

Oh, forgot to say. I have a 87 wiring manual. Let me know what you need.

Mike

**swervin ervin** · 08-27-2003, 04:51 PM

Quote:

Originally posted by 87 STEPPER
UHHH!

Temp & Oil sending unit's dont have any thing to do with emissions.

But the truck will not run with out this info going to the ECM.

I beg to differ. The coolant temp sensor in the intake does have something to do with emissions. This tells the computer what temp the coolant is.

The oil pressure switch lets the fuel pump know when the engine has oil pressure.

The temp sender in the head and the oil pressure sender at the oil filter doesn't go to the ECM, only the gauges.

87 STEPPER · 08-27-2003, 05:01 PM

Yes i know it does but im not shure what he means by removing emissions most people mean removal of the cat & air injection pump & egr valve.

I've never heard of ripping out all the ECM sensors to get rid of your emissinos.

But i guess that would get rid of 'em cuz the eng. wouldn' run thus no more emissions.

**swervin ervin** · 08-27-2003, 07:51 PM

Bruce,

not knowing what exactly they are trying to do but I'm guessing they are going to a carb and trying to figure out which senders to keep.

It would help if we knew the whole story.

dacanuck · 08-27-2003, 08:03 PM

To further complicate this thread, I'd like to add that I disconnected the oil pressure switch by the distributor on my 87 and installed my Autometer sending unit for the gauge there and the truck ran normally and the oil pressure gauge worked fine. Haha. Too bad the 87's in 50 pieces and the cab and frame are gone...

87 STEPPER · 08-27-2003, 08:52 PM

Mike,

I have a feeling you may be correct about ditching the EFI for a Carb.

But he should have been mope specific oh well im shure he'll read this soon and let us know.

jay6891 · 08-30-2003, 09:49 AM

Sorry for the time delay guys, haven't been able to get on the site for a couple of days. Stinking dailup. I was wrong about year model, its a 86. The dude just bought it and was told it was a 87. After several parts runs, and coming back with some wrong things, I decided to look for myself on year model, 86. 87 had a thottle body on it? this had the electric quadra junk. Anyways, back to my question. We put a GM target master engine in it, Eldebrock Performer intake and a 1406 carb, and hedders. It runs now and the choke light wont turn off. I did hook up BOTH oil sending units. The one with the single terminal runs the oil pressure gauge. The other with the 2 terminals does what beside have something to do with the choke light? The temp sender on the intake was removed also, it did have something to do with emissions and vac advance on the distrubter right. the main thing about the wiring is that we did not put the rats nest of rotting vacuum lines on it and some of the sensors for the carb? No smog pump either, back to the 60's with this one. Can I cut all the extra stuff off, was looking for a wiring diagram to trace it all out and see what it does,did. the cruise and ac still works so I'm getting closer. Would just like to clean up the engine compartment . thanks again Jay

mjsmith1223 · 08-30-2003, 10:45 AM

I believe you will find what you need here:

http://www.autozone.com/servlet/UiBr...3d801156bb.jsp

Hope that helps.

Mike
Grand Haven, MI

jay6891 · 08-30-2003, 11:05 AM

mike that is what I needed. thanks man

08-27-2003, 04:26 PM	#1
jay6891 Car Knocker Join Date: May 2001 Location: jefferson,arkansas Posts: 664	wiring diagram 1987 Looking for a wiring diagram for a 1/2 to 87 chevy truck. Anybody know where to find one? Working on a buddy truck and he is pulling all emission stuff. Trying to help but with 2 temp sender and 2 oil senders, good god I love my 68. thanks for any help or suggestions. __________________ 68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit.

08-27-2003, 04:42 PM	#2
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	The temp sensor in the intake is for the computer. The one in the drivers head is for the gauge or light. The oil pressure sender above the oil filter is for the gauge. The one at the distributor is a switch for the fuel pump. Is he switching over to a carb? __________________ Mike 1985 Chevy C-10

08-27-2003, 04:43 PM	#3
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	UHHH! Temp & Oil sending unit's dont have any thing to do with emissions. But the truck will not run with out this info going to the ECM. __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE

08-27-2003, 05:01 PM	#6
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	Yes i know it does but im not shure what he means by removing emissions most people mean removal of the cat & air injection pump & egr valve. I've never heard of ripping out all the ECM sensors to get rid of your emissinos. But i guess that would get rid of 'em cuz the eng. wouldn' run thus no more emissions. __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE Last edited by 87 STEPPER; 08-27-2003 at 05:05 PM.

08-27-2003, 07:51 PM	#7
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Bruce, not knowing what exactly they are trying to do but I'm guessing they are going to a carb and trying to figure out which senders to keep. It would help if we knew the whole story. __________________ Mike 1985 Chevy C-10

08-27-2003, 08:03 PM	#8
dacanuck Registered User Join Date: Nov 2002 Location: Toronto, Ontario Posts: 85	To further complicate this thread, I'd like to add that I disconnected the oil pressure switch by the distributor on my 87 and installed my Autometer sending unit for the gauge there and the truck ran normally and the oil pressure gauge worked fine. Haha. Too bad the 87's in 50 pieces and the cab and frame are gone... __________________ 86 GMC C15 swb. 350/TH350, fully loaded, but wish I had overdrive!

08-27-2003, 08:52 PM	#9
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	Mike, I have a feeling you may be correct about ditching the EFI for a Carb. But he should have been mope specific oh well im shure he'll read this soon and let us know. __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE

08-30-2003, 09:49 AM	#10
jay6891 Car Knocker Join Date: May 2001 Location: jefferson,arkansas Posts: 664	Sorry for the time delay guys, haven't been able to get on the site for a couple of days. Stinking dailup. I was wrong about year model, its a 86. The dude just bought it and was told it was a 87. After several parts runs, and coming back with some wrong things, I decided to look for myself on year model, 86. 87 had a thottle body on it? this had the electric quadra junk. Anyways, back to my question. We put a GM target master engine in it, Eldebrock Performer intake and a 1406 carb, and hedders. It runs now and the choke light wont turn off. I did hook up BOTH oil sending units. The one with the single terminal runs the oil pressure gauge. The other with the 2 terminals does what beside have something to do with the choke light? The temp sender on the intake was removed also, it did have something to do with emissions and vac advance on the distrubter right. the main thing about the wiring is that we did not put the rats nest of rotting vacuum lines on it and some of the sensors for the carb? No smog pump either, back to the 60's with this one. Can I cut all the extra stuff off, was looking for a wiring diagram to trace it all out and see what it does,did. the cruise and ac still works so I'm getting closer. Would just like to clean up the engine compartment . thanks again Jay __________________ 68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit.

08-30-2003, 10:45 AM	#11
mjsmith1223 Registered User Join Date: Aug 2003 Location: Michigan Posts: 94	I believe you will find what you need here: http://www.autozone.com/servlet/UiBr...3d801156bb.jsp Hope that helps. Mike Grand Haven, MI __________________ 1986 GMC C1500 High Sierra w/ mid-70's-ish 350 & th350 tranny 1976 Wellcraft 19.5' cuddy, Chevy 250 I6 -- FOR SALE

08-30-2003, 11:05 AM	#12
jay6891 Car Knocker Join Date: May 2001 Location: jefferson,arkansas Posts: 664	mike that is what I needed. thanks man __________________ 68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit.



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