1998 Chevy Blazer Slow acceleration at start and at higher

  • 6 CYL
  • 4WD
  • 178,000 MILES

I recently bought my blazer and when I test drove it, it seemed fine, no leaks from under neath, ran great and drove fine.

Now I am wondering, When I start it up. Let it run for a couple minutes and then start to drive. It feels like it does not want to operate at 100%. This only last maybe a block or two. Then as I am on the fre way. And say I give it a lot of gas. It does the same thing. Its bogging down. What could I do to help this or fix this problem all together.

IE Spark Plugs & wires. Injector cleaner. So on and so on.


Austen MN
Do you
have the same problem?
Thursday, October 16th, 2008 AT 5:13 PM

1 Reply

OK. Let's start here. That engine requires a lot of fuel pressure (65psi) to fire the injectors. Chevy's are notorious for fuel pump problems around that year. (Give or take a few years) I would definately start there. Check fuel pressure or have it checked. It should be checked at idle, as well as under a load. You can hold the brake and throttle it up a little and watch the pressure. You'll need to duplicate the problem to find the cause, though. If it falls on it's face while you're powering it up, see if the pressure drops. If so, replace the pump. Replace the filter when you do. Sometimes, a stopped up fuel filter will lead to a pump problem. Always replace the filter when a pump is replaced. The fuel volume is also critical. You can have adequate pressure but not enough volume. (Actual fuel) Sometimes, this is caused by the filter itself. The filter is definately a cheaper "TRY". IF that don't fix it, well. You know what's next. The pump.
If the fuel is ruled out, have the exhaust system checked. IF the converter is stopped up, it'll bog down simply because it can't breathe. If you're a "do-it-yourself-er", take an O2 sensor out or simply disconnect the exhaust pipe and start it and try to duplicate the problem. If the exhaust is stopped up, doing this will allow the motor to breathe, and therefore work like it's supposed to. If that doesn't help, repost and we'll try again.
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Thursday, October 16th, 2008 AT 6:42 PM

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