1991 Mazda MPV 4 cyl. 193126 miles

Tiny
BETTY2
  • MEMBER
  • 1991 MAZDA MPV
I bought a *lemon* about 4 months ago :( :cry: . It runs GREAT. When it runs! But, since about 3 weeks after I got it. The Service engine light came on to stay, and with a FULL tank of gas. It just *ran out of gas* like stalled at a speed of approx 35 - 40 mph, and would not restart! It also goes through gas like water. Approx. 73 mile per TANK (4 cyl. 2.6)! And, it is very difficult to start first time for the day. But, once it starts, it starts FINE every time. Until it has *rested* for 8+ hours. And, it does NOT *like* stop lights, drive through window service, or any type of slow *idling* type traffic. It spits and sputters until I get it up to 30+ MPH.

I put it on the diagnostic, and it returned that 5 sensors were malfunctioning. Ie; 09-Water thermosensor, 11-intake air thermosensor, 12-throttle sensor, 14-atmospheric pressure sensor, and the 08-Mass Airflow sensor which I HAVE replaced since the diagnostic (with NOT much resolution). I have also replaced plugs, wires, rotor, cap, AND distributor (again with NOT much resolution). But, it still uses gas and still *run out of gas* stalls with plenty of gas in the tank. I have used injector cleaner in the gas tank several times.

Despite it's *problems*.I LOVE this van! The body is solid, the interior like new (except for fading over 16 years), and it handles like a dream. WHEN it runs! So, I have decided to replace ALL 5 sensors for my own piece of mind. But, someone told me that the problem *could* be in the Fuel pump and/or the throttle body?

What is your suggestion on this? COULD it BE the fuel pump AND/OR the throttle body? Is the fuel pump (in the tank) difficult to get to? And, is it expensive to replace either part.I have my *own* mechanic (son), I just want a *second* opinion??

Your help is greatly appreciated! :D

Betty2
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Wednesday, April 4th, 2007 AT 2:30 PM

4 Replies

Tiny
RASMATAZ
  • MEMBER
Check the fuel pressure and the EGR-as for the pump in tank-get that young buckaroo to pull it out if need changing.

Good Luck
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Wednesday, April 4th, 2007 AT 4:05 PM
Tiny
BETTY2
  • MEMBER
Thanks for your quick response (my son is out of town on business right now).

One thing I forgot to mentioned in my original post, and maybe will give you something to help *pin point* the problem as for the fuel pump. When I open the gas cap to fill the tank (whether low or not). One twist, and the gas cap almost *POPS* off the filler spout with a loud *swush* sound!

Would this indicate anything related to the fuel pump pressure?

I used to be GOOD at troubleshooting (NOT much for fixing, though). BEFORE the days of *Electronic* control. But, these cars today. ONE problem can indicate MANY *different* things! So, I'm trying to *brush up* with this *lemon* I bought, LOL!

Thanks again!

Betty2
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Wednesday, April 4th, 2007 AT 6:25 PM
Tiny
RASMATAZ
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Madam

The rushing noise that's coming from the spout-could be an indication of a problem within the evaporation system

You begining to make me think Vapor lock-do the fuel pressure check and then comeback. You got a bad Damian here.

5 sensors Wow! And didn't find Damian. Recheck the brain for any stored code/s again

When key is in On-do you hear the pump for atleast 2 secs-and also hear a click somewhere on the front.
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Wednesday, April 4th, 2007 AT 9:44 PM
Tiny
HIPPO800
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The most important thing is to do a compression test.
If the engine is healthy, then check the distributor timing, and even check the crank/camshaft timing marks for deliberate misalignment.
Then, wrangle all the sensors.
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Sunday, August 5th, 2007 AT 5:43 PM

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