Acceleration problems...

CoughlinJ · #1 10-25-2007, 07:19 PM

Hey all, I just replaced a messload of stuff on my blazer, and went to drive it (not start it) for the first time in three months. I was rewarded with the truck not wanting to get out of first, so I checked and filled the transmission fluid. Nothing. As soon as I go to accelerate in it, it just immediately looses rpms, and starts to sputter. I can park it and rev it up high, but once I put it in gear, it just doesn't want to go. I've done some looking, and I think it might be the MAP sensor that's gone bad, but I'm not sure. I don't see any check engine lights coming on so.... HELP!

Things I replaced in the three month period. (Just in case.)
Master Cylinder
Catalytic Converter
Muffler

That's a partial list, but those were some of the larger things I replaced.

old_master · #2 10-25-2007, 07:30 PM

Year, engine, and transmission would be very helpful.

CoughlinJ · #3 10-25-2007, 07:37 PM

wow. That totally slipped my mind. 1992 s10-blazer tahoe, 4.3l, automatic.

82Stang · #4 10-26-2007, 07:23 AM

Although the engine light is not on, I believe there can still be a code present. So scanning would be wise.

How about fuel filter?

CoughlinJ · #5 10-26-2007, 12:54 PM

Fuel filter is new. As for the scanner, I have no idea where to get one, and driving the car anywhere is practically out of the question. Anyone know where I can buy one for cheap?

82Stang · #6 10-26-2007, 01:51 PM

Usually Advance or Autozone scan for free.

Maybe try unplugging the MAP sensor and see how it runs w/o it plugged in.

CoughlinJ · #7 10-31-2007, 11:07 AM

I just unhooked the sensor, and it did everything fine. There was a little bit of over reving but other then that, it felt like a brand new engine running in there. Thanks stang.

CoughlinJ · #8 10-31-2007, 02:19 PM

Ok, so I bought a new map sensor, and I installed it, but it's just back to not working again. Whenever I really step on the gas it just sputters and the rpms drop like a rock.

old_master · #9 10-31-2007, 04:21 PM

Sounds like it could be a fuel pressure issue. Have you checked it?

CoughlinJ · #10 11-12-2007, 06:07 PM

Quote:

Originally Posted by old_master

Sounds like it could be a fuel pressure issue. Have you checked it?

Sorry for the gap in my response, I haven't had alot of time. How would I got about checking the fuel pressure?

old_master · #11 11-12-2007, 06:23 PM

What is the 8th character in the VIN? It will be either a "W" or a "Z".

CoughlinJ · #12 11-12-2007, 07:21 PM

it's a w.

old_master · #13 11-12-2007, 07:52 PM

Service port is at the rear of the engine near the distributor. 60 to 66psi, cold engine, fuel pump running, engine off. Must remain above 55psi for 3 to 5 minutes after pump shuts off.

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