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-   -   99 Chevy Astro Misfire runs rough code P0301 (http://www.diychatroom.com/f46/99-chevy-astro-misfire-runs-rough-code-p0301-164715/)

Hardway 11-26-2012 12:30 AM

99 Chevy Astro Misfire runs rough code P0301
 
99 chevy Astro Van anybody know how to test a fuel injector to see if it is causing a misfire? 6 cyl eng runs rough. P0301 code.

joecaption 11-26-2012 01:31 AM

http://www.youfixcars.com/testing-fuel-injectors.html

47_47 11-26-2012 01:22 PM

P0301 is cylinder 1 misfire. Check the secondary ignition first (wire, coil tower, spark plug). You can measure the resistance of #1 injector and compare to others. All should be 10% of each other. To go further, you will need specialized tools.

Hardway 11-27-2012 01:44 AM

Quote:

Originally Posted by Hardway (Post 1060534)
99 chevy Astro Van anybody know how to test a fuel injector to see if it is causing a misfire? 6 cyl eng runs rough. P0301 code.

This is a spider aray under the intake and the resistance will not tell you if the injector is clogged. I am looking for a way to activate the number one injector. Wire, coil, spark plug good and plug fires.

47_47 11-27-2012 07:36 AM

1 Attachment(s)
You can install a fuel pressure gage and manually PWM the injector with a tester, measuring and comparing the fuel pressure drop between injectors. You can also use a noid lite to check the ECM output and wiring to the injector.

cjm94 11-27-2012 08:50 AM

Those spider injector assemblies have poppet valves on each hose that are common to plug. There isn't much that works to clean them without an injector flush machine that will pulse the fuel psi and that only works half the time. Gm has an updated assy. that gets rid of the poppets and uses regular injector tips on the hoses.

Hardway 11-27-2012 10:22 AM

Quote:

Originally Posted by cjm94 (Post 1061490)
Those spider injector assemblies have poppet valves on each hose that are common to plug. There isn't much that works to clean them without an injector flush machine that will pulse the fuel psi and that only works half the time. Gm has an updated assy. that gets rid of the poppets and uses regular injector tips on the hoses.

cjm94 so is there a way to acess the injector to check it with out taking the intake off? I should have never taken it in for repair. I should have bought a few test items. Because they replaced the MAF, Computer, fuel pump, cap, rotor and then some. damaged the gas cap, the air box. Needless to say they are done.:mad: I have since purchased my own OBD scanner, Fuel pump pressure gauge. I have It narrowed dow to number one fuel injector. Cold here now and no garage.:wink:

cjm94 11-27-2012 10:47 AM

No way to get to them with the intake on. It's not a very DIY friendly set up. I know people think dealers are a rip off but for about a hundred bucks you would have had a good diagnosis instead of a couple thousand dollar mistake. I hope they stood behind there mistakes. I'm not saying dealers don't make mistakes but good ones would not have charged for the stuff they misdiagnosed.

Hardway 11-27-2012 01:10 PM

Quote:

Originally Posted by cjm94 (Post 1061570)
No way to get to them with the intake on. It's not a very DIY friendly set up. I know people think dealers are a rip off but for about a hundred bucks you would have had a good diagnosis instead of a couple thousand dollar mistake. I hope they stood behind there mistakes. I'm not saying dealers don't make mistakes but good ones would not have charged for the stuff they misdiagnosed.

Taking the intake off is not an issue, just wanted to make sure it is an injector. This all started out at the dealers, they went out of business. From what I understand $1,500.00 to replace the injectors. I can do it my self. I should have bought a few test items and did the trouble shooting my self. :(

cjm94 11-27-2012 03:29 PM

Taking the intake off is the hardest part of that job. You should be able to find the injector assy for 200-500 depending if you go with the old style or the updated ones

Hardway 11-27-2012 03:59 PM

Quote:

Originally Posted by cjm94 (Post 1061769)
Taking the intake off is the hardest part of that job. You should be able to find the injector assy for 200-500 depending if you go with the old style or the updated ones


$250.00 online

P0301 code is a misfire on number 1 cylinder so would I be wrong assuming the problem is something dedicated to cylinder number one?



I still have to check compression.

cjm94 11-27-2012 04:10 PM

If you have spark and compression you are pretty safe with the injector. A cylinder leakage test would rule out a burnt valve but injector poppets are very common on those

Hardway 11-27-2012 09:37 PM

Quote:

Originally Posted by cjm94 (Post 1061794)
If you have spark and compression you are pretty safe with the injector. A cylinder leakage test would rule out a burnt valve but injector poppets are very common on those

That is what I am thinking, bad injector.

Hardway 11-27-2012 11:25 PM

Will I need any special tools to replace the fuel injectors?

cjm94 11-28-2012 06:59 AM

No you shouldn't just basic tools


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