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mazda mpv mini van wont start after problem


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jflowersci
New User

Jul 11, 2011, 6:38 PM

Post #1 of 4 (4298 views)
mazda mpv mini van wont start after problem Sign In

My 1992 mazda mpv v6 3.0 fuel injection and it just developed a problem. I make it a point to use Marathon gas which supposedly carries some stp gas additive it. I try keep it a 1/2 full or a little less. So recently after putting some gas in I also added a half a container of the small stp gas additive. When driving home I saw a clear patch of road and decided to punch the accelerator to try to clean out the system. My car accelerated and it took all took quite a bit to stop it. Even after pulling over and turning off the key and restarting it it raced. It was reving but never redlined.

Then after a couple of restarts it would only go very, very slow and I nursed it home driving no more than say 25 mph. Now I can't even start it and it seems like it's not receiving gas.
Is this a fuel problem or a transmission problem? I seen recently people driving older cars were having problems because of the gasoline and it was causing repair problems.
Any thoughts are greatly appreciated.

Personal info deleted


(This post was edited by Hammer Time on Jul 11, 2011, 6:58 PM)


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jul 11, 2011, 8:23 PM

Post #2 of 4 (4281 views)
Re: mazda mpv mini van wont start after problem Sign In

Trying to think where you should start with this...hmmm.

Have you inspected the throttle body and throttle cable just to be sure you don't have a sticking throttle valve?

If the throttle is closed and doesn't stick open, your next order of business would be to spray some starting fluid into the engine to see if it will run on spray. You can also use propane if it is available. If it runs on spray, you should check fuel pressure. You'll have to plumb a gauge between the fuel filter and rail. It should be around 31-38 psi with 18-22 inches of vacuum on the fuel pressure regulator and 38-46psi with no vacuum on the fuel pressure regulator.

You can also check to see if there are any trouble codes stored in the engine controller. Near the left front fender in the engine bay there is a single wire green connector. With the ignition off, jump the green connector to ground. Turn the ignition on and the MIL lamp with flash any trouble codes stored. If the MIL light goes on and then stays off, there are no codes stored. The codes are two digit.

Let us know how you make out.





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jflowersci
New User

Jul 17, 2011, 11:27 PM

Post #3 of 4 (4256 views)
Re: mazda mpv mini van wont start after problem Sign In

Thank you very much for replying.

Unfortunately I am at a loss for most of the things you prescribed. Although I have some mechanical aptitude and my experience it is rather limited. I'm good for changing the air filter, the distributer cap and rotor and maybe a few smaller obvious items.

I have checked what I believe to be the throttle inside the engine compartment, a small cabled (size of a wire) semicircular device that I pulled by hand. It worked easily without hangup. I later sprayed it with wd 40 for good measure.

I have sprayed starting fluid and cleaner done the throat of my previous carburated vehicles but I'm at a loss where to spray fluid in the Fuel injection. Do you spray it down the plastic tunnel after the air filter?

As for the codes I have no reader and don't know what a mil is nor do I have access to a fuel pressure guage and wouldn't know where to hook it up anyway.

I decided to change the fuel filter as it seemed a logical thing to do and shouldn't hurt. I question if the fuel additives eat away at what may be paper filters. I also realize that this will introduce air into the fuel line. I assume this is not a big issue and perhaps this is where the starting fluid may come in handy. It's a bit hard to access the bottom line as it comes out of the filter so it will have to be cut and I can connect it to some additional line. I have not been able to acertain if the botton line is 5/16 or 3/8 inch. Neither the car parts store nor local Mazda dealer could tell me. I bought a foot of both. It's only 1/16 of a inch circumfrence difference. Would this be enough to make a big difference in performance?

Thank you again for the help. Any additional thoughts are appreciated.


re-tired
Veteran / Moderator
re-tired profile image

Jul 18, 2011, 10:50 AM

Post #4 of 4 (4249 views)
Re: mazda mpv mini van wont start after problem Sign In

Do not cut your fuel line . I would recommend that you take your vehicle to a garage and have it checked . You were smart enough to admit your lack of formal mechanics training. Follow thru and git to a shop .


LIFE'S SHORT GO FISH






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