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New engine no start

OneTon

By OneTon
in Ask A GM Technician

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OneTon New Member

OneTon

Posted
Posted

First let me start by saying I generally deal with Fords, so I know there are some things I am unaware of when it comes to GM.

Now for the problem. 95' GMC K 1500 with a 350 and the Z-71 package. The owner experienced a MAJOR engine failure "the crank broke at the first journal". Engine has since been replaced with a long block assy. from one of the major chains. Everything is back in the vehicle. All harness and ground connections have been put back. Dist. has been installed and verified to be in phase with the cam. All plug wires have been triple checked for correct order. By the way this is a TBI setup.

Here's the fun part. When I go to crank it, turns over just fine, will not catch and backfires through the throttle body. It will turn over several times, and then backfire. I have gone through the dist. completely. New stator pickup and module.

What am I overlooking? :cheers:

 

Thanks, Wes

kev2 Enthusiast

kev2

Posted
Posted

I am confused you have a 1995 TBI engine with a CMP and A CKP ??

 

crank & cam sensor I thought were MFI (multi port)and CSFI (Central Sequential Fuel Injection) type engine .....BUT its been a while

 

 

EDIT ...I was confused...by phased in with cam...thinking CMP

 

................................................................................

.......................................

first any codes...Could the valves be to tight...have you checked cranking vacuum, looking for problem area's EGR vaalve and the TBI base gasket being damaged...Are the injectors spraying or dumping...set timing connector is it pluged in...you can try this unplug injectors and check timing with a timing light

 

 

use AC delco only

mshell56118 Enthusiast

mshell56118

Posted
Posted
I am confused you have a 1995 TBI engine with a CMP and A CKP ??

 

crank & cam sensor I thought were MFI (multi port)and CSFI (Central Sequential Fuel Injection) type engine .....BUT its been a while

 

 

EDIT ...I am confused...by phased in with cam...

first any codes...Could the valves be to tight...have you checked cranking vacuum, looking for  problem area's EGR vaalve and the TBI base gasket being damaged...Are the injectors spraying or dumping...set timing connector is it pluged in...you can try this unplug injectors and check timing with a timing light

 

 

use AC delco only

 

 

 

 

 

Are you positive your plug wires are correct Gm numbers there cylinders differently then ford

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