The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board > projects and builds 88-98

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 05-06-2019, 06:06 PM   #1
Second Series
Registered User
 
Second Series's Avatar
 
Join Date: May 2015
Location: Tukwila Washington
Posts: 127
1990 Chevy K1500

1990 Chevy K1500. Basically the same set up, 5.7 V8, 5LM60 5-speed transmission. Shortbed stepside, Iím comfortable with Ĺ yard of gravel so this is big enough for that although I do like the full size bed of the GMC for plywood and sheetrock.
33Ē tires! Looks good, but a stiff ride probably due to the torsion bars were cranked up so the fronts would clear. This originally had A/C and Iíd like to put it back, the compressor was replaced with a pulley. Iím not a fan of led lights, but it has led lights on all four corners. I might be able to use the rear fixtures from the GMC when I part it out. The fronts are completely different with four headlights where the GMC has two.
I purchased this truck last month and drove it home. It runs well, I like it and my son is eager to ride. The check engine light is on and the check gauges light is on. The temp and oil gauges fluctuate. I ran a check on the codes and got 43 Electronic Spark Control (ESC) circuit. Iíve been reading up on that and will start by checking the resistance of the knock sensor. Iíll remove the gauge cluster and check the contacts in the connector to try to fix the gauge issue. The brake light is on and the parking brake cable is saggy. Iíll look into the cable first and go from there. A good driver/project.
Attached Images
 
__________________
1947.2 1 ton Chevy Panel
1955.2 Chevy Suburban
1955.2 Chevy 6700 Bus/RV
1990 Chevy K1500
2001 Chevy Tracker ZR2
Second Series is offline   Reply With Quote
Old 05-09-2019, 11:23 AM   #2
Second Series
Registered User
 
Second Series's Avatar
 
Join Date: May 2015
Location: Tukwila Washington
Posts: 127
Re: 1990 Chevy K1500

Here's my other truck: http://67-72chevytrucks.com/vboard/s...d.php?t=786383
At first I was going to just have one thread on both truck, but decided to have two separate threads.

I crawled under and found the knock sensor just above the oilpan in front of the starter. I pulled the wire and checked the sensor with an ohmmeter. 3.9k is what it measured, so thatís good. I put the wire back on and went to the top. I used this diagram to help locate the ESC Electronic Spark Control.

I removed the connector from the ESC and measured the Blue wire with the ohmmeter, it read .6Ω, not good. After fiddling about awhile, I went back under and pulled the connector off the knock sensor again and the wire measured open as it should. I put the wire back on the knock sensor and measured the end by the ESC and now it was at 3.9kΩ. I should mention that when I first pulled the connector off the knock sensor, I noticed the center part of the sensor was loose. So it looks like there is an intermittent short, probably the knock sensor.

Looking at the picture I took, I can see where the center part has a crack. I could probably put some high temp glue on it and be good for now. Iíll clear the codes and run it awhile and see if it throws any codes. So far it looks like a simple fix. I have read about problems directly and indirectly related to the knock sensor that can cause a code 43. I donít want to throw parts at it, instead Iím trying to figure out how things work and determine the problem.
Attached Images
   
__________________
1947.2 1 ton Chevy Panel
1955.2 Chevy Suburban
1955.2 Chevy 6700 Bus/RV
1990 Chevy K1500
2001 Chevy Tracker ZR2
Second Series is offline   Reply With Quote
Old 10-09-2019, 02:46 PM   #3
Second Series
Registered User
 
Second Series's Avatar
 
Join Date: May 2015
Location: Tukwila Washington
Posts: 127
Re: 1990 Chevy K1500

I Put the rear on jack stands and determined the passenger side brake cable was seized. I replaced that and now the parking brake holds. The brake light is on and I get a code 3 ďOpen Dump Valve or ECU MalfunctionĒ. Iím not sure how to proceed on this, I disconnected the battery to clear the codes, but the brake warning light remains on.
I put some epoxy on the knock sensor and gave it a day to cure. I was poking around underneath and touched the battery wire at the starter. The stud in the solenoid is loose, I can rotate the wire, stud and nut together. The truck starts fine, but it will be a problem on the side of the road. I also noticed a wire on the driverís side coming from between the rotor and backing plate. It looks like a í95-up ABS rotor was installedÖ
Iíve been reading about the RWAL system and the brake warning light, Next thing is to ohm out the connector to the dump valve, when I get some time.
I want to drive this truck, so I filled up the gas tank and got a load of gravel. The bed went low with Ĺ yard, my ĺ ton truck handled the weight better, but at least I wasnít rubbing the 33Ē tires on this K1500. I pulled my flatbed trailer out of the bushes and went for a drive. The K2500 is partly dismantled and I loaded up the longbed, front clip, hood and bumpers. The scrap yard is paying 1 cent a pound, so maybe $10.00 for these truck parts. I decided to keep them and make an art fence. That bed floor would make a nice shed roof, I couldnít buy corrugated tin at that price. Iíll put an ad up before I get out the torchÖ
No more check engine or check gauges light and no fluctuating temp and oil gauges. I hope the shorted knock sensor was all that was the problem, only one way to find out, drive! The truck didnít come with door keys, so I bought a pair of door lock cylinders, when I get timeÖ
Attached Images
 
__________________
1947.2 1 ton Chevy Panel
1955.2 Chevy Suburban
1955.2 Chevy 6700 Bus/RV
1990 Chevy K1500
2001 Chevy Tracker ZR2
Second Series is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 09:03 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com