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Old 08-03-2013, 09:50 AM   #1
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99 blazer help


I have a 99 blazer when at a stop it shakes bad, and on taking off feels like huge lose in power, it's not loud and I smell fuel once it drives it's okay but really rough????? Help????

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Old 08-03-2013, 11:49 AM   #2
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99 blazer help


I changed plugs, wires, cap, filters,etc happened while driving it yesterday shakes a wobbles

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Old 08-03-2013, 01:45 PM   #3
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99 blazer help


Since it is unstable even while idling, have you had it on a computer diagnosis to determine the basic problem?

If it runs well and checks out after the massive part replacement, then it comes down to transmission and running gear.I have similar vehicles (175,000 and 145,000 miles) and the are little noisy for a block or so, but seems to be air and short term temperature start up situation since they run perfectly once the wheels turn.

That engine is usually bullet-proof, so if it runs properly it comes down to controls and drive train.

Dick
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Old 08-03-2013, 01:48 PM   #4
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At a stop sign it's shaking and ready to stall once it drives it's fine.. But taking off seems to beg very sluggish like there am exhaust leak but there isn't miss of power bad,,,
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Old 08-03-2013, 01:49 PM   #5
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This has just happened had the vehicle for 5years
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Old 08-03-2013, 01:52 PM   #6
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Did you replace all the parts before, or after it started running badly?

It could be a combination of things. Motor mounts is the first thing that comes to mind when you mentioned bad vibration at a stop.
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Old 08-03-2013, 01:53 PM   #7
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I did a full tune up, about 6 months ago haven't changed any parts..
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Old 08-03-2013, 01:54 PM   #8
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But when it's in park the power very sluggish
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Old 08-03-2013, 01:55 PM   #9
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Quote:
I changed plugs, wires, cap, filters,etc happened while driving it yesterday shakes a wobbles
did you change the plugs, wires, cap filters etc..... before or after it started running badly??
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Old 08-03-2013, 01:56 PM   #10
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Way before
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Old 08-03-2013, 02:04 PM   #11
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Sounds like a vacum leak. A bad PCV valve can let crank vent to outside giving you a gas smell. Can also contribute to vacum leakage.

I would still suspect bad motor mounts. Sometimes worn out motor mounts can go unnoticed until something else goes wrong. ...You develop a vacum leak (for example), causing the motor run a little rough, and you get all sorts of wicked vibrations.

Is this an auto or manual transmission?
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Old 08-03-2013, 02:06 PM   #12
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Automatic
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Old 08-03-2013, 02:06 PM   #13
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I changed valve few months back
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Old 08-03-2013, 02:10 PM   #14
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Here's what I would do:

a) double chec all vac / PCV lines for any cracks/breaks.

b) spray carb cleaner around that area and the intake manifold gasket area. (while its running) if there is a vac leak, you will notice the engine idle change when it sucks up the carb/TB cleaner.

c) Pull the plugs to check for fouling or burnt plug that might cause a miss.

d) compression test.
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Old 08-03-2013, 02:11 PM   #15
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Will do thanks I will keep up updated

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