Basket Case Non-runner HELP!!!! - Page 2

chevy_lifted_4x4 · 06-02-2007, 04:51 PM

its a Z with TBI

MT-2500 · 06-02-2007, 06:37 PM

Check for flooding or leaking injectors.
Check map and coolant sensors.
What is the fuel pressure?
You have something driving it rich.
Good Luck
MT

chevy_lifted_4x4 · 06-02-2007, 07:24 PM

checked the codes and nows it getting more. #33 and #42. I'll check fuel pressure too.

MT-2500 · 06-02-2007, 08:17 PM

Check the codes out.
They may be trying to tell you something.
MT

chevy_lifted_4x4 · 06-02-2007, 11:48 PM

code 33 says map. is there any way to check the map sensor to see if its bad? im just tired of buying parts and they fix nothing.

MT-2500 · 06-03-2007, 10:26 AM

Check the voltage readings and for good engine vacuum to it.

Rick Norwood · 06-05-2007, 02:18 PM

This may sound a little stupid and may be covered already. Check the distributor rotation. if the wires are set up for a clockwise rotation but the swapped engine was counterclockwise you will never get it started. I've actually seen this issue before. If this is the case, you may simply need to remove and replace the wires on your distributor cap in the opposite order.

chevy_lifted_4x4 · 06-06-2007, 09:46 PM

I replaced the map sensor and the code went away. Still runs exactly the same. Runs good for 10 seconds when cold then idles rough and smokes like crazy. Havent got a chance to check fuel pressure yet. Could this be a prob? I also seem to remember I had the truck running a lot better before I re-installed the cat and muffler. Could this be clogged up?

chevy_lifted_4x4 · 06-07-2007, 12:12 AM

I took off the cat and muffler and that is all cleared out. The MAP has good vaccum to it. The codes are still coming up. # 33 says low vac to MAP and 42 says ECM has seen an open or grounded EST or bypass circuit. What does this mean?

MT-2500 · 06-07-2007, 09:54 AM

Quote:

Originally Posted by chevy_lifted_4x4

I took off the cat and muffler and that is all cleared out. The MAP has good vaccum to it. The codes are still coming up. # 33 says low vac to MAP and 42 says ECM has seen an open or grounded EST or bypass circuit. What does this mean?

You need to get a good repair manual and go threw the repair flow chart for code 42.
Could be wiring or est module or bad pcm.
On the map sensor code check wiring and actual engine vacuum and vacuum to map sensor.
What is the engine vacuum readings at idle and at 2000 rpm?
MT

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