2008 Trailblazer cranks over but won't start.

[tonyl]

2008 Trailblazer 4.2L quit running while jump starting another vehicle. Now it will crank over but will not start. Anybody have any ideas?

 

[BrianF]

My first check would be the fuel pump. Either listen for it on key on or check for pressure at the fuel rail.

 

[budwich]

check your fuses.

 

[tonyl]

My first check would be the fuel pump. Either listen for it on key on or check for pressure at the fuel rail.

I will check that, thank you.

 

[tonyl]

check your fuses.

I did they are all good, thanks.

 

[mrrsm]

Welcome to GMT Nation...

(1) Please Visit THIS Link and and Follow the Instructions in Post #2 on How To Download a Genuine GM Full OEM Digital Shop Manual for YOUR Vehicle:

Need service manuals? Get them here!

********* Please note that the FireFox browser has issues with the password handling and that these downloads are not under HTTPS, flagging them as security risks. Chrome and Edge work fine once you allow the download. ********* ATSG 4L60E Manual 4L60E Rebuild Manual 2005 GMC Envoy XUV...

gmtnation.com

(2) Visit THESE Links-Videos and Use the Wiring Diagrams from your Downloaded Service Manual to investigate the Steps Involved in Diagnosing a Crank - NO Start Condition.

Possible Ignition Switch Issues:

https://www.youtube.com/results?search_query=trailblazer+cranks+no+start+may03lt

How to Check Fuel Pressure:

Check the 125 AMP Fuse...

(3) Visit THIS GMT Nation Link to investigate any sketchy Engine Block and Body Grounds:

Electrical Ground locations

While troubleshooting a bad ground I came across some scans of the service manual regarding electrical ground locations for our platform posted on another site. This includes both short and long wheel base, as well as both 4.2L and 5.3L. Credit goes to Wex...

gmtnation.com

 

[Mooseman]

And we also have this thread that goes through it extensively:

Cranks but won't start

 

[TollKeeper]

You said you checked your fuses.. But did you check your Mega-Fuse?

 

[vipergg]

2008 Trailblazer 4.2L quit running while jump starting another vehicle. Now it will crank over but will not start. Anybody have any idea

Check megafuse . People mistake the megafuse post for the negative and end up blowing out the fuse .