2001 Chevrolet Blazer Repair Question
Coolant Loss & Hesitation
You need to fix the intake leak first you could very well have two issue though.Lets get that leak fixed and go from there.What was the exact code number for that maf code?Vacuum leaks can cause maf codes.
Fix the leak and as for the hesistation might want to check the following below and also refer to this link:http://www.2carpros.com/articles/engine-hesitates
Could be caused by one of the following below
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Manifold absolute pressure sensor.
Fuel pressure regulator leaking or defective fuel pump.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.
Note:If it doesn't apply disregard it and keep testing
68 questions asked
Ok - after many hours of disassembly, inspecting, cleaning, and reassembly the coolant leak is fixed. This included replacing intake manifold gasket, valve cover gasketes, all heater hoses and radiator hoses, new thermostat, and new valve cover gaskets too. Although I was excited the blazer started and no leaks, I was disappointed when I felt the hesitation during the test drive. On my initial post, I should also have mentioned that I replaced one vacuum line and fuel filter.Also, I did re-inspect 2 of the plugs readily accessible and they looked good. The distributor cap and rotor also looked good during my diassembly of the intake. Also started blazer in dark looking for open plug wires - but did not see any. There are still no codes showing or pending. What to do next? Your help is most appreciated.
So is it a hessiation or a lack of power?Also how did you check for codes?
Hesitation to me - using Actron CP9135 menu item 1 to check for codes - there is also menu 4 to check for I/M monitors - all those show ready and return no codes
Have the fuel pressure checked and monitored if its within specs
68 questions asked
Have you checked the plugs and wires yet?
Replaced the Throttle Position Sensor - instant results. Thanks again for all your help on this one.
Your welcome glad to hear you got it fixed.