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1998 Mazda MPV 98 Mazda MPV sputtering

Tiny
SOULSHAKER
  • MEMBER
  • 1998 MAZDA MPV
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 132,000 MILES
98 mazda mpv sputtering on fullly pressed accel. Hot(engine). Will not sputter on full accel cold(engine). Replaced fuel pr. Reg, fuel pump, filter, cap, wires, plugs, timing belt, intake air temp sens. Trying coolant temp sen. Next. Any help would be appreciated.
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Thursday, July 2nd, 2009 AT 9:11 AM

11 Replies

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
If the coolant temp sensor don't fix it then get back to me and I will walk you though a couple of tests. You will need a digital multi meter for some of the tests.
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Thursday, July 2nd, 2009 AT 9:29 AM
Tiny
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Thank you for your help, I really appreciate it. I checked the coolant sensor and got 2.64 ohms at 20k r cold(ambient) engine. Got.64 ohms after running engine 5 minutes, I am guessing that sensor is good? I unplugged the connector and read across the two terminals of the sensor. Also 2 check engine codes, from Autozone, P0420 catalyst efficiency monitor malfunction bank 1.001ehaust leak.002 check other codes.003faulty cat converter-there are 2 on this vehicle, does not specify which one. Other code is P1335.
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Tuesday, July 7th, 2009 AT 11:51 AM
Tiny
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Ok P0420 is bank one cat or O2 sensor problem. Now bank 1 is the bank that number one cylinder is on which will be the right or passanger side of the engine in this case. I do not show a P1335
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Wednesday, July 8th, 2009 AT 8:32 PM
Tiny
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I t looks like I will have to bring it to the dealer so their scanner can determine the exact problem, would that be the case here?
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Thursday, July 9th, 2009 AT 10:12 PM
Tiny
RACEFAN966
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Ok when you tested the temp sensor what was the air temp at the time of the test? As for taking it to the dealer thats up to you. We can run some test on the O2 sensor if you like just let me know and I will get the test procedure and take it from there.
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Friday, July 10th, 2009 AT 9:04 AM
Tiny
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Temperature was 72 outside, read 2.62 on coolant sensor. Will a bad 02 sensor cause the vehicle to not restart after driving and it sits for an hour? The engine will crank but not start. I have to turn key to off, fully depress accel. And then it will start. Vehicle will start after sitting for 5-15 minutes with no problems, also, starts every morning no problems.
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Friday, July 17th, 2009 AT 10:33 AM
Tiny
RACEFAN966
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OK coolant sensor probably isn't the problem. It is off but only by 10 degree's so I don't think this will cause your problem. Now I would like to test the TPS. What you will do is check resistance between term C and D. Now you will also need a feeler guage. With .006 you should have continuity between those terms. Now with .020 you shouldn't have continuity. let me know what you find. Here is a pic so you know which term is which.


https://www.2carpros.com/forum/automotive_pictures/249564_Graphic_105.jpg

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Saturday, July 18th, 2009 AT 9:20 AM
Tiny
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Resistance on term. C&d.006 = 3.38, .020=3.32 on 20k scale. On term a&b.006=0, .020= open.
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Sunday, July 19th, 2009 AT 7:38 PM
Tiny
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Ok if you would ohm the air charge temp sensor in the intake or upper plenum and get back to with the temp at the time (do this when the engine is cold) and ohm reading. Thanks.
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Monday, July 20th, 2009 AT 5:08 PM
Tiny
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39.1 on 200k ohm setting at 66 degrees outside temp on cold engine. (New air temp sensor installed last year.)
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Friday, July 24th, 2009 AT 11:15 AM
Tiny
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Ok that sensor is out of range but not enough to bother with. Now back to the codes on hand. P0420 is the bank one O2 sensor or exhaust leak have you done anything with that yet? Now if you would take it back to a one of you local parts stores that does a free scan and scan it again and write down the codes and then have them cleared and get back to me with what codes are still there so we can see what to do next. I am thinking that we need to test the tps and the cam sensor. Get back to so we get this figured out. Thanks.
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Saturday, July 25th, 2009 AT 9:08 AM

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