Hard Start in 96 454. Please Help, this is a doozy

[brycebba]

Nope, no codes at all

- Bryce -

 

[SAATR]

What year is your wife's Yukon?

 

[brycebba]

99.

- Bryce -

 

[SAATR]

Try swapping the MAF with your wife's, just for kicks. If that doesn't do anything, then put your original back and swap the MAP sensor. They should be the same part between the two engines. Really at a loss without better diagnostic tools, so swapping known good parts can eliminate other variables.

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[brycebba]

So those maf units are the same ones? Isn't the map sensor the one under the very front of the fuel rail? I tried to pull the o2 sensors but they are very stuck so I sprayed them with wd40 and will try again tomorrow

- Bryce -

 

[skylark]

SAATR is talking about the mass air flow sensor, the one just after the air filter.

 

[brycebba]

Yeah I was asking about the location of the map sensor that he mentions to try second if the maf doesn't do anything

- Bryce -

 

[skylark]

Yeah I was asking about the location of the map sensor that he mentions to try second if the maf doesn't do anything

- Bryce -

DOH! My bad. I forget where it is on a Vortec.

 

[SAATR]

I'm not sure where the MAP is on a 454, but it looks like this:

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[88GMCtruck]

454 MAP sensor is under the top plenumn