code 54.....Stalling Blazer

spasticone · #1 02-08-2005, 08:37 PM

Ok 94 Blazer 4.3 auto.

A few months ago I had a stalling/hard start problem on 4 occasions. It threw Fuel pump/fuel delivery codes so a new fuel pump went in. Now 3 months later it stalled while idling. It started right up. I drove home and it stalled 4 times in 10 miles. Each time it wouldn't start right away and I didn't hear the fuel pump. Then I would try it and the fuel pump would kick on. "I noticed the pump part only one time. " It's now showing code 54. I'm not very familiar so I need some help.. Thanks to all...

BlazerLT · #2 02-08-2005, 09:51 PM

Search this forum and the blazer forum for CPI injector

spasticone · #3 02-09-2005, 10:24 AM

I don't think it's the injection spider. I thought fuel got into the oil when it was leaking... It could be the cpi regulator sticking, but I was thinking more fuel pump/relay related. I could be wrong though. I'm sure one time I didn't here the pump running when I tried to start it and then When I tried it again...the pump ran and it started right up. When it does start, it runs perfectly. Also, code 54 is computer malfuntion... what 's that about?

blazee · #4 02-09-2005, 10:38 AM

Code 54 indicates a problem with the fuel pump circuit.

spasticone · #5 02-09-2005, 10:53 AM

What does that include? fuel pump and relay??? or the entire fuel delivery system.... Injectors back to fuel pump?

blazee · #6 02-09-2005, 10:56 AM

Try swapping out the fuel pump relay with one you know is good and try it for a while, if no more problems replace the bad relay.

blazee · #7 02-09-2005, 11:39 AM

blazee · #8 02-09-2005, 11:55 AM

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BlazerLT · #9 02-09-2005, 03:12 PM

Quote:

Originally Posted by spasticone

I don't think it's the injection spider. I thought fuel got into the oil when it was leaking... It could be the cpi regulator sticking, but I was thinking more fuel pump/relay related. I could be wrong though. I'm sure one time I didn't here the pump running when I tried to start it and then When I tried it again...the pump ran and it started right up. When it does start, it runs perfectly. Also, code 54 is computer malfuntion... what 's that about?

Hard starting in a CPI injection engine is more or less always the regulator not keeping fuel pressure up.

Check your fuel pressure and do a CPI injection system check by removing the top IMTV valve under the vortec plate on the top of the engine and look down inside the engine with a flashlight and look for golden washed spots and the smell and pooling of fuel.

Don't disregard my advice, I think I know what I am talking about.

spasticone · #10 02-10-2005, 08:19 AM

I understand where your comming from on the cpi injector, but this was a fuel pump relay problem. Somehow a terminal was fried on my plug. Maybe from the old dying pump.. I don't know. It is fixed and going great.

blazee · #11 02-10-2005, 09:14 AM

Glad to hear it's going again.

blazee · #12 02-10-2005, 09:23 AM

You should probably do a little checking to see why it was fried. It could have been as simple as a loose connection or it may be a bad wire somewhere.

BlazerLT · #13 02-10-2005, 12:44 PM

Also, it is best to check the CPI injector for leaking anyways.

They all become defective. It is just a matter of time. Heading it off early will save your engine from a lot of damage caused by fuel getting into the oil.

I strongly suggest you check for leaking anyways.

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