MX6 won't start/ Fuel Injectors question

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MX6 won't start/ Fuel Injectors question

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MX6 won't start/ Fuel Injectors question - 1/17/2007 10:14:23 AM

mtwarogal

Posts: 2
Joined: 1/17/2007
Status: offline

I have a 94 Mazda MX-6, It won't start, died while I was driving. have tried many things, but have a question about a reading I got on the fuel injectors
I read that they are suppose to have a 12 to 16 ohms of resitance. I was thinking that one would have high resitance, but none of them do. they all have low resitince I am getting a reading between 6.3 to 6.6 ohms on all of them. when I should have 12 to 16 ohms. Could this be a computer (CPU) issue. I would hate to replace another part that would have nothing to do with it not starting.

Post #: 1

RE: MX6 won't start/ Fuel Injectors question - 1/17/2007 11:56:34 AM

mtwarogal

Posts: 2
Joined: 1/17/2007
Status: offline

More info. The car died on the hwy. I have been getting bad gas mileage, and had the Cadillac converted changed last week. They said I need a new fuel pressure regulator also. So I changed that. Had car towed shop said that the diagnosis machine said bad timing. I replaced that last year, so I took it apart and looked at the timing at it was right where it needed to be. I change the spark plug wires and spark plugs, distrubor cap and rotor. Tested for spark and I am getting it on all plugs, took line off from top of fuel filter. And I am getting fuel to that point. When I try to start the car though it sounds like it is getting no gas. That is why I tested the resistance of the fuel injectors. Open to ideas

(in reply to mtwarogal)

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RE: MX6 won't start/ Fuel Injectors question - 1/23/2007 10:34:30 PM

joesperformance

Posts: 6
Joined: 1/23/2007
Status: offline

check the hard metal lines under the tb, it is easy to kink them and u will not get any fuel then.

(in reply to mtwarogal)

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RE: MX6 won't start/ Fuel Injectors question - 1/27/2007 10:35:29 PM

precisionboost

Posts: 9
Joined: 1/14/2007
Status: offline

Hi... I'm new here so I don't know this forum very well.... but I have lots of experience with engines and performance mods.

I don't know how much experience you have with vehicles... but it sounds limited so I'm not sure which procedures you will be able to do.

I am a little confused about the statement "the diagnosis machine said bad timing. I replaced that last year, so I took it apart and looked at the timing at it was right where it needed to be"

I'm not familiar with the MX-6 yet..... does it use a distributor?

Even if the timing is off the car should still start....

Step 1) Reomve all four spark plug wires ( write on them or use tape to identify which one goes to which plug )
Step 2) Remove the first spark plug in the far right cylinder
Step 3) Look at the spark plug... it should be a nice chocolate brown... not black... and not white ( post a picture if you want me to diagnose how the car is running )
Step 4) Assuming the spark plug is good.... attach it to one spark plug wire... allow the body of the spark plug to sit on a grounded part of the chassis and have someone crank the engine for 2-3 seconds
Step 5) If you see a spark... then it's not a major problem with the ignition
Step 6) Remove spark plug and test the other three wires with the same procedure ensuring that you get a spark from all four wires

The reason you leave the other wires off is incase the engine starts.... which would not be a good situation.... with the wires off the engine can't fire.

Only crank it for a few seconds.... you don't want to flood the engine

If all goes good and you have spark.... the only other problem is fuel.

You should be able to measure the fuel pressure if you have a Schrader valve (looks like a valve from a bicycle)... again.... not familiar with the Mazda engines... so I don't know if you have a Schrader valve.

The tool to measure fuel pressure is fairly cheap.... you should be able to get it off Ebay for under $20

Here is a decent example... http://cgi.ebay.com/ebaymotors/Fuel-Pressure-Tester-Kit-New-KAL2530-KAL-Equip_W0QQcmdZViewItemQQcategoryZ43989QQihZ018QQitemZ280073370196QQrdZ1

So... if you check your fuel pressure that will let you know if your fuel regulator is working or if there is some other issue such as a blocked/kinked line or a bad fuel pump.

If you don't have a schrader valve.... well.... that makes things harder.

If it were me..... I would remove the fuel rail and drop the injectors into four pop bottles and crank the engine

This way you can see the flow of gasoline.... it doesn't help you to know the fuel pressure.... but it will definitly confirm if your getting fuel into the cylinders.

If you have fuel and spark and the engine still won't start then I'm affraid your problems may be much more serious.... you may have a damaged cylinder head.

I guess one other thing is air...... you should ensure that when you depress the acclerator pedal that the butterfly valve in the throttle body opens up.

Anyways...... this should be simple enough for a back yard mechanic kind of guy to do..... I hope this helps a bit.

(in reply to joesperformance)

Post #: 4