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

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-02-2020, 04:48 PM   #1
74CustomK20
Registered User
 
74CustomK20's Avatar
 
Join Date: Oct 2014
Location: Tell City, IN
Posts: 635
Question Rebuild 91 k1500 help

I'm stumped on this one, so turning to the board for some help. I recently picked up a 91 k1500 (350 auto 4x4) with a bad driver side head gasket. Found #1 tdc before tearing it apart. Came apart easily and went back together just as easily. Went to fire it up today, cranks easily. It won't fire though. It just blows back through the intake n throttle body. The firing order should be 18436572 correct? Started with #1 pointing at the #1 cylinder and went clockwise. Maybe I have it wrong? Or do I have the valves too tight? Did the tighten go wiggle, then 1/4 turn more method. Anyone have any insight?
__________________
Big Nate
Carp. Local 224. Buy made in the USA!
96 F250 Supercab 4x4 7.3
74CustomK20 is offline   Reply With Quote
Old 06-02-2020, 05:21 PM   #2
ChevyTech
Registered User
 
Join Date: May 2004
Location: Minnesota
Posts: 4,486
Re: Rebuild 91 k1500 help

18436572 is correct.
The first thing that comes to mind is do you have it on TDC of the compression stroke or the exhaust stroke.

You could turn it over checking for compression coming out of the number one spark plug hole and see if when you get it to TDC the distributor rotor is pointing to number 1 or to number 6 cylinder on the distributor cap.
__________________
For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.

Last edited by ChevyTech; 06-02-2020 at 05:22 PM. Reason: And a few words to make it more clear.
ChevyTech is offline   Reply With Quote
Old 06-02-2020, 06:10 PM   #3
74CustomK20
Registered User
 
74CustomK20's Avatar
 
Join Date: Oct 2014
Location: Tell City, IN
Posts: 635
Re: Rebuild 91 k1500 help

When I put the distributor back in, it (rotor I think it's called) was pointed toward the #1 cylinder so I assumed that was true tdc.
__________________
Big Nate
Carp. Local 224. Buy made in the USA!
96 F250 Supercab 4x4 7.3
74CustomK20 is offline   Reply With Quote
Old 06-02-2020, 07:01 PM   #4
Palf70Step
State of Confusion!

 
Palf70Step's Avatar
 
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 40,984
Re: Rebuild 91 k1500 help

Do you have spark at the plug?

If there fuel getting to the TB?

Are the head ground straps connected?

Just a couple things that popped into my head.
__________________
Bill

1981 GMC High Sierra SWB Stepside

Member of Louisiana Classic Truck Club (LCTC)
Board Vendors
Bill's Gallery
Life isn't tied with a bow, but it's still a gift.
Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!
It's scary when you start making the same noises as your coffee maker.
Palf70Step is offline   Reply With Quote
Old 06-02-2020, 07:55 PM   #5
ChevyTech
Registered User
 
Join Date: May 2004
Location: Minnesota
Posts: 4,486
Re: Rebuild 91 k1500 help

Quote:
Originally Posted by 74CustomK20 View Post
When I put the distributor back in, it (rotor I think it's called) was pointed toward the #1 cylinder so I assumed that was true tdc.
Did you line up the timing mark on the front crank pulley?
How did you make sure it was on the compression stroke and not the exhaust stroke?

The crankshaft makes two revolutions for every one revolution of the distributor. One time the crankshaft lines up with TDC on the compression stroke and the next turn the crankshaft will go by TDC on the exhaust stroke.

The distributor rotor could be pointing at number one plug wire when it should be pointing 180 degrees away at the number six plug wire.

An easy way to see if it is on the compression stroke is to remove the number one spark plug and see if it is blowing air out the plug hole as it comes up on TDC. If not it is on the exhaust stroke and number six cylinder is on its compression stroke.

Number six cylinder is 180 degrees (directly across) from number one on the distributor cap.
__________________
For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.

Last edited by ChevyTech; 06-02-2020 at 07:58 PM. Reason: Add more
ChevyTech is offline   Reply With Quote
Old 06-03-2020, 04:09 AM   #6
speedygonzales
Registered User
 
speedygonzales's Avatar
 
Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,456
Re: Rebuild 91 k1500 help

When they say the rotor points to number one, they mean the position of the contact in the cap, NOT the actual cylinder.
__________________
99 Z71 (98 body style)
Pride and joy
speedygonzales 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 02:01 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com