After I've driven then parked my 02 blazer, I could get back in 30 minutes later and it takes 10 or so cranks to fire up. When it is cold it fires right away. I've read it could be a injector problem. I've read the CPFI to MPI swap but wondered if my year already has the MPI. Have the vin W L35 V-6.

I would appreciate any help on both questions.

 

My vehicle is starting to do that now too. What the hec? It fires right up when its cold. like in a half crank or so. But if it I park it and start it up within 10 to 45 minutes, it cranks and cranks and cranks and cranks and cranks some more and starts like one cylinder starts up at a time limping up to proper RPM idle. I have 180 KM on my 2001 truck that has the 4.3 Vortek engine. I changed the spark plugs and fuel filter to no avail.

Any help would be greatly appreciated.

 

To the OP, you may or may not have the MFI spider. Do you have an EGR valve on the front of the engine between the alternator and the a/c compressor? If you do, you likely have the SCFI spider.

Have either of you checked the plugs, wires, cap, & rotor or tested the ICM & coil?

 

I changed my plugs. I ordered rotor & cap so I will be changing that. I'll have to look at ICM & coil.