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I have a 2002 Blazer and it is hard to start we replaced fuel pump,fuel filter,crank sensor unit , oil line ,oil pressure Gage, did Tune -up Rotor button ,rotor cap wires spark plugs

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Change the coolant temp sensor(the one for the computer not temp gauge on the dash)
The computer uses this sensor but not alot of others until it reaches "closed loop" a few minutes after starting.
Make sure fuel pressure is correct.

Posted on May 06, 2017

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By not running the fault codes first , you have missed the real faulty sensor that is causing the problem
nothing of what you replaced is linked to hard starting, like , ambient temp sensor ( used to report the air temp for the setting of the rich mixture need for starting)
baro sensor ( used for reporting the air density used to set the mixture setting
Maf/ Vaf sensors ( again used for mixture settings)
heated oxygen sensors ( used to adjust the gas composition by reporting the results to the ECM

Posted on May 06, 2017

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2002 cavalier 2,2 eco, stalls sometimes, wont start other times. No power signal at fuel pump when it wont run. Replaced relay, fuel filter, coolant sensor. usually starts. Solutions anyone?


With intermittent issues, have to test when problem is ongoing. How long since a tune-up?
If it cranks good but won't start, have a helper crank it while you check for spark at the plugs, if spark everywhere, use a gage and check proper fuel pressure. Also, check fuel injector pulse. If your missing all three, check for rpm signal, comes from crank sensor.
If you can narrow it down to one system, we can test that one system. Any applicable trouble codes?

Jul 29, 2017 | Cars & Trucks

1 Answer

My 2002 Envoy started knocking on the way home and the oil pressure dropped om the gauge.


I wouldn't drive the vehicle till you find out what is wrong. Have you ever changed the oil and filter, plus, overall tune-up?
Is this high-mileage engine? You could use an analog gage in place of the oil pressure sending unit, just to double check the gage. If no oil pressure, could be the oil pump? If this is a high-mileage engine replacing the oil pump may not help. You may need an engine overhaul. Do you have any cylinder compression?
Because that knocking, hope you don't have internal engine damage?

Mar 12, 2016 | 2002 GMC Envoy

1 Answer

I have a 1997 Chevy cavalier z24 it's hard to start it and when it does start I smell raw gas I just replace spark plugs and map sensor and throttle body sensor wen put it in gear a the car die


I saw what you replaced, but, didn't see any testing? Use a gage and check proper fuel pressure. Also, see if pressure will hold for a bit, everything off. If the pressure drops like a rock, you have a fuel pressure leak. Check fuel pressure regulator vacuum line, if it has gas in it, the regulator is faulty. Could have leaking fuel injector or the fuel is leaking back through the fuel pump.
Any applicable trouble codes? To check codes yourself, at the least, you need an obd2 code reader.
Your coolant temp sensor might cause it to flood, if it is flooding? How long since a tune-up? Don't replace anything unless your testing points in that direction.
Smell of the crankcase oil dipstick, if it smells like gas, I wouldn't drive it till you fix the problem. Change oil and filter as many times as needed to get rid of the gas.

Feb 02, 2016 | Cars & Trucks

1 Answer

1988 Chevy s-10 blazer 2.8 liter back fires and pops just started doing it changed fuel injunction map sincere completed tune up oil change valve gadgets wire hook up fuel filter still problems.


check timing, check compression, did you replace cap and rotor. it could be the ignition module or pickup coil in the distributor. how is the fuel pressure and volume, check with a gage and volume container.

Aug 14, 2015 | Cars & Trucks

1 Answer

Sputters at full throttle and wont idle


Run pressure test on your fuel injectors. Fuel pump might not be suppling enough fuel line pressure.

Apr 13, 2014 | 1986 Chevrolet S-10 Blazer

1 Answer

My 91 blazer (Jimmy) just quit running. Looks like getting gas. Just turns over and over. Won't start. Just instantly WTF?!


What do you mean it looks like its getting gas ? Try removeing the fuel filter its an in line filter located on the frame rail under the drivers door . Then put a plastic soda bottle on the line that is comeing from the gas tank and turn the key to run for 5 seconds . If you don't get at least 3 to 4 ounces of fuel then your fuel pump is bad . Or its the relay in the glove box or its the oil pressure sending uint . Have you been haveing problems with the oil pressure gauge or dose it start hard a long cranking time . Long cranking is the relay oil pressure problems is the sending unit but it is a back up power supply for the fuel pump . If the filter is clogged the pump is probably shot you could try replaceing the filter but that pump olny last 10 years at best it just depends if its been replaced at one time witch may be likely seenig its 20 years old the new ones were better a lot of upgrades on them check it out i can't do it for you olny you can do it good luck

Sep 22, 2011 | 1991 Chevrolet S-10 Blazer

1 Answer

I have a 2002 Chevy Blazer with a 4.3. It has two engine codes, p0170 and p0172, which I believe are fuel rich bank one and two. It starts great, but after warming up, is very hard to start and requires...


Can you post the fuel pressure spec for us? You have the spider fuel system? When you use a gage and check proper fuel pressure, with the key off will the pressure hold for a bit? If it drops like a rock, you have a fuel pressure leak.
Smell of the crankcase oil dipstick, does it smell like gas? If so, either you don't change your oil and filter very often or you have a fuel leak getting into your crankcase. If the problem is the latter, you fix the problem then change oil and filter as many times as necessary to get rid of the gas.
Check the fuel pressure regulator and vac line.

May 26, 2017 | 2002 Chevrolet Blazer

1 Answer

96 GMC pickup w 350 engine, starts hard after like 8 hours.


could be your fuel pump relay you should check to see if the pump runes for about 3 sec. when you turn the key to the on position. It should if not the oil switch is turning on the pump after you achieve pressure.
if not check the relay. also with the pressure gauge hooked up check if your pressure drops off fast after you turn off the car. if so you need ether a pressure reg or a fuel pump.
hope this helps

Jun 20, 2009 | 1996 GMC Sierra

1 Answer

My suburban will crank the engine dut will not start


If the oil pressure sensor is defective and or fails to have oil pressure, it is a failsafe for engine protection. Try this: If the oil pressure gage or light show that oil pressure is present, but it will not crank, then open the fuel line at the throttle body a slight amount, ie. two flats then turn the key and starter just a wee tap or two and have some one watch the fitting for fuel pressure flow. If it leaks as it should, then you have your fuel pump working, however, if still no fuel then you must ck the inline filter under the frame. It could be completely clogged, there again, you could loosen the tank side of the filter and hit the key again and watch for leaks only if you don't get it at the throttle body. If you don't get any pressure leaks (you will get gravity leak on the tankside of the fuel filter) ie, squirting out, then you will likely have to replace the intank fuel pump. '
good luck

Jan 06, 2009 | 1999 GMC Suburban

1 Answer

Blazer takes forever to start


Have you done a leak down test on the fuel pump? If the pump check valve doesn't hold pressure the fuel drains back to the fuel tank, then you have prime the lines with fuel before any is delivered to the injectors, hence a long crank time. Install a fuel pressure guage and start the engine, then turn off the engine and wait overnightm the system should not loose more than 5 PSI

Sep 30, 2008 | 1997 Chevrolet Blazer

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