Why will my Blazer not start only when cold?

2QUEST41

MEMBER
1993 CHEVROLET BLAZER
6 CYL
4WD
95,000 MILES

1993 Blazer with 4.3 Vortec will now not start cold. Runs great after we spray fluid in the intake, itstarts all the rest of the day.

Sunday, September 11th, 2011 AT 2:56 PM

5 Replies

PROMECHANIC

MECHANIC
536 POSTS

You need to have your fuel pressure checked. It sounds like it is not getting fuel when you first try to start it. You need to hook up a gauge before you try to start it when it is cold, then see what the pressure is when you are trying to start it.

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Friday, January 29th, 2021 AT 2:00 PM

2QUEST41

MEMBER
5 POSTS

We checked the pressure, it was 52psi, what now?

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Friday, January 29th, 2021 AT 2:00 PM

PROMECHANIC

MECHANIC
536 POSTS

The next thing you need to check is if the fuel injectors are letting fuel in. You will need a tool called a "noid light". These are available at most any auto parts store. Just make sure they give you one that will work for your vehicle.

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Friday, January 29th, 2021 AT 2:00 PM

2QUEST41

MEMBER
5 POSTS

We had a new spyder assbly installed, and new sensors, and new regulators, and over $1000 in all on this thing last fall.
Why does it run perfectly after the first start? Ran fine yesterday after we got it started, ran fine today after first start(sprayed into the intake with fluid) Does this worse every week now.
We drove it all over town today, but it won't start first time tomorrow again? It can sit for a few hours, but not over night.

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Friday, January 29th, 2021 AT 2:00 PM

PROMECHANIC

MECHANIC
536 POSTS

That is why you need to do the test I told you. To see if the injectors are firing. There is no other way to figure this out except to keep doing the diagnostics.