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Old 09-08-2012, 10:12 PM
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Default 1995 Hesitation issues

I am hoping someone can provide help on the hesitation problem I am
having with my 95 Blazer, It is a 4dr, 2wd V6 4.3. It starts and idles fine, however
when I put it in D and press the gas it hiccups and hesitates. Me and my friends
have already check fuel filter, and replaced the Idle Air Control Valve. In the last
year i have already replaced the ECM, EGR, Spark plugs and wires, and distributor.
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Old 09-08-2012, 11:07 PM
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Have you done a fuel pressure test on the truck? When was the last time you inspected your spark plugs? Are they clean, showing a lean burn or clogged?
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Old 09-09-2012, 08:44 AM
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+1, also try cleaning the MAF sensor.
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Old 09-09-2012, 03:07 PM
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Let me know when you figure this one out.

My truck has been sitting in the driveway for over a month with the same problem.

And YES it works; I made it come on by unplugging my MAF Sensor to make sure.

I have noticed when I first start it up it runs great for about a minute or two.
I mean it runs like a brand new one but after it sits there and idles for about 1 minute it seems like the timing is off or something and it will backfire if you crack the throttle open really fast.

I'm letting mine sit until I get some extra cash to go at it again.

I've replaced the following with mostly AC Delco or Delphi parts;

Fuel Pump
Fuel Filter
Fuel Injection Spider w/ new pressure regulator
Distributor Cap
Rotor Button
Spark Plugs
Plug Wires
Camshaft Position sensor
ECM- With a known good used one flashed to this trucks Vin#
Map Sensor
Idle Air Control Sensor
Throttle Position Sensor
EGR Valve
Purge Valve
Catalytic Converter

02 sensors
Crankshaft Position Sensor
Physical Timing (with dist cap off turn crank back and forth to get a approx degree)
Ignition Switch (connections/ground/hot)
Did the wire wiggle test to see if it made any difference when I wiggle the wires around

I don’t know where to go from here but when I figure it out I will post it because this seems o be a common problem with these aggravating little pains in my ***.
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Old 09-09-2012, 04:45 PM
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awhoff is an unknown quantity at this point

well just got back in from the garage, plugs look great and my 95 does not have a MAF.
Replaced the fuel pump today because i had already bought it and have the same issue.
Idles fine, upon acceleration it lopes before it is willing to go.
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Old 09-09-2012, 08:14 PM
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viper1ex19, The OP has a 95 with CMFI, your 97 has CSFI: two totally different computer control and fuel injection systems requireing totally different diagnostics. Best if you start another thread, we can help you diagnose yours in that thread.
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1995, 95, acceleration, bad, blazer, common, fix, ground, hesitate, hesitation, oil, pressure, problems, s10, switch

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