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Old 08-05-2006, 07:36 PM
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Mazda Fuel Pressure Issue

Sorry, not a hotrod but need some help.

My sons 1994 Mazda Protege surges while driving. It acts like (for the lack of a better description). fuel, no fuel, fuel, no fuel. If you hold the throttle down it surges pretty rhythmically, go, no go, go, no go.

Is this a pump issue or a pressure regulator issue.?

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Old 08-05-2006, 10:36 PM
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rev limiter malfunction? B6 motors have pickey, pricey fuel filters. are you sure your getting constant fire? Does it do it at any throttle position or just under heavy load?
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Old 08-06-2006, 12:37 AM
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Changed out the fuel filter yesterday and it still does it.

Does it at all throttle positions.

Its definately a fuel issue, no misfire at all.

Forgot to mention that it doesnt do it all the time, just seems like its always 20 miles away

Today he drove to work, about 20 miles away and it was fine but on the return trip later in the day it started doing it again.
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Old 08-06-2006, 01:12 AM
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It's acting just like my Ford did when the throttle position sensor went bad. Surging, one day off one day on, etc. I asked the computer and it told me the TPS was bad. Have you tried pulling codes?
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Old 08-06-2006, 10:49 AM
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I was leaning a little towards a TPS sensor to. But I have never had one work intermittently. Not saying that it can't happen, I've just never seen one that only worked sometimes. I work on a lot of miatas and the proteges use pretty much the same system. I've found that these motors surging is , surprisingly, usually from lack of air. But a lack of fuel could also cause the same thing. I think there is a gas tank access panel in the floor of the trunk, but I would probably try to scan for codes before I tore into the fuel tank. I've got the shop manual for many miatas in .pdf format, if there is something that I could send you that might help let me know. I'll look to see if you can get the codes on a protege to flash and let you know.
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Old 08-06-2006, 11:10 AM
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There should be a diagnostic box , it's usually blue, next to the battery. I think its about a 1" x 1.5" rectangle. Count 3 spaces over on the top row, that should be the TEN jumper connection. The first space on the second row should be the GND jumper connection.

Engine code scan.
1. Warm engine to operating temperature.
2. Switch ignition "OFF."
3. Connect jumper wire between diagnosis connector "TEN" and "GND" terminals.
4. Switch ignition "ON."
5. If codes are present, the MIL will light in patterns illustrated in the MALFUNCTION CODE EXPLANATION (above).
6. When all codes have displayed, the sequence will repeat until the jumper wire is removed.
7. Record codes and repair as necessary.
Following repairs, perform after-repair procedure.

AFTER-REPAIR PROCEDURE:

1. To erase codes from ECU memory, disconnect negative battery cable and depress brake pedal for at least five seconds.
2. Reconnect battery cable.
3. Ensure engine is at normal operating temperature.
4. Install jumper wire between diagnosis connector "TEN" and "GND" terminals.
5. Switch ignition "ON."
6. Ensure that the MIL no longer flashes malfunction codes.
If any new codes are retrieved, repeat step 6 of inspection procedure (above). If the same code(s) recurs, recheck repair work and look for what else might cause the code(s).

above is courtesy of ALLDATA
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Old 08-06-2006, 11:13 AM
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The egr valves on these cars are a pain in the *** as well.
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Old 08-06-2006, 12:23 PM
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Ill pull the codes on it today.
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Old 08-07-2006, 10:50 AM
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Pulled the codes and the only one was that the oxygen sensor had detected a lean/rich fuel condition.

I hooked up a pressure gauge with a long hose and taped it to the windshield so I could watch it while I drove it. It only cuts out while driving. A few miles into the drive the pressure suddenly dropped to 5-10 psi and then the vehicle cut out but then pressue immediately returned to specs. It did this a couple times during the drive.

Im assuming pump since the reading was taken before the pressure regulator.
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Old 08-10-2006, 10:06 PM
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first check the intake tube for leaks/holes.
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Old 08-10-2006, 10:16 PM
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I replaced the fuel pump a couple days ago. That did the trick. I had to run out of town for a couple days so I was unable to report the good news that it was fixd. Thanks for all the help.
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