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Username Post: 1990 K1500 timing issues        (Topic#366411)
hawk1122 
Poster
Posts: 53

Reg: 10-01-17
09-15-21 11:26 AM - Post#2827135    

Hey all, I have a 1990 k1500 5.7 auto, and the timing has been very weird on this truck. Last year i put a new timing chain in and distributor. Ever since i did those two things the truck runs and drives fine, doesn’t feel like any loss of power or bogging. However, at idle i can hear small misses and pops from my exhaust, not while driving though. And it looks like the only way it runs is at 10 degrees maybe even more (the metal tab with the degrees is pretty rusty hard to read it). I know i did the timing chain correct (had to do it twice because i screwed up first time lol) and know i did the distributor right. I haven’t been too worried about it since the truck runs and drives fine (lost about 1 mpg ever since). However i discovered that my advance wire under my dash seems to be jumped and not plugged into anything. So I’m wondering what could this be causing and how could i fix this. Thanks. I’ll upload a picture of the wire to show what i mean when i can



Edited by hawk1122 on 09-15-21 11:29 AM. Reason for edit: No reason given.

 
CowboyTrukr 
"10th Year" Silver Supporting Member
Posts: 4697
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
09-15-21 11:47 AM - Post#2827136    
    In response to hawk1122

Not having the advance lead active will leave the engine struggling.

Let’s see what you have. While you’re under there, look to see if you have the e other end laying loose in there someplace.

Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
someotherguy 
Senior Moderator
Posts: 29480
someotherguy
Loc: Texas
Reg: 08-01-03
09-15-21 12:59 PM - Post#2827144    
    In response to hawk1122

On a 1990 the timing disconnect should be under the hood behind the plastic cover for the electrical center, so I wonder if you're looking at the correct wire. Sure, it comes inside the cab to reach the ECM but the disconnect is not reached under the dash for a 1990; it moved there around 1994. Pics of it by year in this thread -> https://www.chevytalk.org/fusionbb/showtopic.php?t...

Verifying correct timing with the wire disconnected should be step #1. Engine warmed up, tan/black timing bypass wire disconnected, set for zero. Take some time to wire brush the timing tab off and mark the zero point with a white paint pen so you can see it. Do the same with the line on the balancer. They'll stand out really well with the timing light at that point.

It should idle OK at zero, may not sound perfect, but once you plug the timing bypass wire back in, it should advance significantly (around 12 degrees or so) and run better.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
hawk1122 
Poster
Posts: 53

Reg: 10-01-17
09-15-21 01:22 PM - Post#2827146    
    In response to someotherguy

You're right I was looking at wrong wire, video I watched when i was doing the job in order to set the timing was a 94 but the title of video said "88-95" and the wire/connector looked very similar to the one right next to my blower under my dash, same location. For some reason the pictures on the post wont load but I know where your talking about I'll take a look, was probably problem whole time bet the truck will be good in about an hour or 2 lol. I will post the wire I'm talking about because it still doesn't look right in general.



Edited by hawk1122 on 09-15-21 01:23 PM. Reason for edit: No reason given.

 
hawk1122 
Poster
Posts: 53

Reg: 10-01-17
09-15-21 01:30 PM - Post#2827147    
    In response to CowboyTrukr

[image]https://imgur.com/PM4g1PC[/image]

This is the wire I'm talking about, which I realized is wrong one (look at other reply), but this still does not look right in general plus it had a half-censored electrical tape job around it



 
someotherguy 
Senior Moderator
Posts: 29480
someotherguy
Loc: Texas
Reg: 08-01-03
09-15-21 06:41 PM - Post#2827167    
    In response to hawk1122

  • hawk1122 Said:
[image]https://imgur.com/PM4g1PC[/image]

This is the wire I'm talking about, which I realized is wrong one (look at other reply), but this still does not look right in general plus it had a half-censored electrical tape job around it


Pic doesn't show in the post but the URL to it does work; that is absolutely not anything to do with the timing bypass. Look in the location mentioned behind the plastic cover on the electrical center under the hood.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
hawk1122 
Poster
Posts: 53

Reg: 10-01-17
09-19-21 10:42 AM - Post#2827398    
    In response to someotherguy

Yea I was able to get to it yesterday runs better now, set it to 0 with it disconnected and plugged it back in. I actually set it to 1 degree after with it disconnected, seems to like that more than 0.



 
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