1999 Chevy Blazer poor acceleration

KREN0049

MEMBER
1999 CHEVROLET BLAZER
6 CYL
4WD
AUTOMATIC
95,000 MILES

My 99 Blazer has poor/no acceleration upon starting. After 30 seconds or so, I hear a rushing of fluids sound and then the car runs fine (almost like a whooshing sound). It feels like a vaccuum isn't being sealed correctly for the first 30 seconds. The car varies from absolutely no accelereation with rocking, to sputtering for 30 seconds or so. When warm, it runs great. I have replaced the spark plugs and wires, new air filter, cleaned the throttle body, and added fuel additives to try to remove excess carbon. None of it has helped so far.

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Do you hear the wooshing from in the car (under the dash)? Has the check engine light come on? Have you checked fuel pump pressure?

Here is a how to for checking pressure. Check it to make sure it is good. Also, if you didn't replace the fuel filter when you tuned it, you may want to consider it.

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

You will need a gauge to check it, but most parts stores will lend or rent them.

Run a back pressure test on the exhaust. It could be a partly blocked exhaust. The 30 seconds is about what it takes for it to light off. Does it use any coolant? oil?

Let me know what you find.

Joe

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Monday, December 21st, 2009 AT 1:04 PM

KREN0049

MEMBER
3 POSTS

I checked the fuel pressure and it is fine, so the problem is not the fuel pump. The check engine light has never come on. The sputtering upon first starting the car appears to have gotten better. It only does it maybe a quarter of my cold starts (never does it if engine temp is warm before starting). In the fall, the engine sputtered every time I started it cold.

It doesn't use any coolant and it doesn't use any oil. My water pump broke about a month ago, so I did a radiator flush then. I will have to check the exhaust. Thanks for the suggestion.

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Tuesday, December 29th, 2009 AT 12:54 PM

KREN0049

MEMBER
3 POSTS

I checked the fuel pressure and it is fine, so the problem is not the fuel pump. The check engine light has never come on. The sputtering upon first starting the car appears to have gotten better. It only does it maybe a quarter of my cold starts (never does it if engine temp is warm before starting). In the fall, the engine sputtered every time I started it cold.

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Tuesday, December 29th, 2009 AT 12:57 PM