01 ZR2.

Had a starting problem on Friday, but after a few mins of cranking it finally started. Runs great after it started and started great until this morning. I had some new plugs I was planning on putting in so I threw them in just because. It was time.

This morning it cranks but doesn't fire. Checked the cap and rotor, they are good and were replaced last December. Checked for spark and it looks good. Had my girlfriend turn on the ignition and listened for the fuel pump. It comes on and shuts off like it should.

I took my actron scanner and checked for codes. Nothing came up.

Been doing some searching and can't really decide where to go from here. Most of the threads say to check what I've already checked. I don't see any wires disconnected or any obvious problems.

Any ideas? I need to use it for work tomorrow.

Thanks for looking.

 

where did ya check for spark? Check it at a plug to bypass any sensors etc that could be after what you are checking.

 

I held a spare plug on the exhaust manifold and cranked it over. Nice hot blue spark.

 

pour a lil bit of gas in the throttle body. if its got a hot spark,its not a ignition issue. If it runs then cuts off then its probally a weak pump,which is typical to blazers. Only buy a ac delco/delphi pump unless you like dropping the tank once a month.

hit up autozone they lend out the fuel gauge. its 100-150 bucks (refundable deposit,its due to the punk thieves) pressures gotta ping at 60+ and hold above 55ish for 10 min.

 

I gave that a try and no go. Before I tried that it smells like and acts like it's flooded. Of course that's the old school carburetor guy in me talking.

 

Ok my buddy had a fuel pressure gauge, shows 57 psi with the ignition on.

 

Does it hold @ 57?

 

I had the same problem if fuel pressure checks out. Make sure your battery is fully charged see if you have the same problem. I had a connection problem battery was not getting a charge it behaved as you have explained

 

On these trucks 57 to 61 is a monster, 57 the poppets will not open.

An injector may be stuck open never letting it get to 58-60 that it needs.

Testing the fuel pressure at the filter would be my next step. Captain Hook has a nice rig to test pressure direct from the filter, search the forum for his pic's print it and go to a plumbing supply show them the pic and they will hook you up.

More then likely your ready for a new fuel pump but it would be a shame to change it without doing a full work up to see if its an injector problem.

 

id call a weak pump,but before you do it,change the filter. if its old and clogged,ish happens.