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Old 11-18-2014, 08:03 PM   #1 (permalink)
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Default MAF problem? 2007 Suzuki Jimny

The instant I start up my Suzuki Jimmy 2007 it revs up and down, falls to 1 revs up to 3. The garage says its the MAF sensor but when I disconnect it myself it does the exact same thing, so I think I just ordered a replacement for no reason. The problem persists through all gears, it seems to just want to punch the engine into its highest gear.

Could it really be the MAF sensor? What else may be the problem?

A bit of background: The garage had to pull apart most of the air flow manifold (is that correct) to get at a coolant leak on the o ring of the water pump and intake valve. When they put it back together, they gave me back the car with this new problem.
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Old 11-19-2014, 01:18 AM   #2 (permalink)
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With that being said that would be your intake manifold. I would double check that there are no leaks on the intake manifold before I start anywhere.
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Old 11-19-2014, 01:51 AM   #3 (permalink)
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you have an air leak between the MAF and the engine, i'd suspect the inlet manifold gasket / o rings especially considering the problem has only arisen after those parts were disturbed. It is not the MAF sensor as you have proved by disconnecting it.

The shop that did the work should repair it for free since they have created the issue.
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Old 11-19-2014, 01:28 PM   #4 (permalink)
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Thanks for the info guys

I'm thinking they had no idea and just made up the MAF problem.

How do they check for the leaks in the intake manifold?

Do you have any specs on this section of the engine?

Cheers
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Old 11-19-2014, 03:07 PM   #5 (permalink)
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Which engine do you have? The 1.3 models don't have a MAF.
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Old 11-19-2014, 03:52 PM   #6 (permalink)
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I have a 1.3 L M13AA engine Spanish. So I have a MAP? (I'm learning...)

Attached is the piece my garage told me is broken that I've ordered. When I un screwed it myself, the piece looked brand new and the pin on the inside looked clean as a whistle, but maybe its still kaput.

I've tried to unhook it again and it does change the sound of the engine a bit, but it still seems to be caught in the high revving.(what's a better way to say that?) This leads me to believe that maybe the problem is the sensor but also with another major vacuum leak. Thoughts?
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Old 11-19-2014, 03:56 PM   #7 (permalink)
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That's a MAP sensor, you can test it by backprobing to measure the voltage. When you unplug it the ECU will revert to fail safe settings, it does sound like it could be a vacuum leak but there are a couple of fail-safe modes that will set a high idle. Is this an OBD2 model?
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Old 11-19-2014, 05:53 PM   #8 (permalink)
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I'm almost positive my 2007 is an OBD2 model. I think thats how the garage decided to tell me that it was the Air Flow Sensor Denso 197400-2230 because they hooked up there mini computer to see what was acting up. But I suppose it could be the MAP sensor as well, or what other electronic components could make my engine rev incessantly?
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Old 11-20-2014, 12:35 AM   #9 (permalink)
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That's definitely a Map sensor. I am somewhat unfamiliar with this vehicle but I would hop straight to the basics first. Normally you check vacuum leaks by spraying carb cleaner on the manifolds, all the cracks where the vacuum hose meets, etc. However Since this is an OBD2 vehicle which it should be because it is a 2007. I would use brake cleaner instead of the harsher carb cleaner. Also with that being said if you have availability to a scanner I would pull codes to see what codes are coming up in your computer. That would give you a general Idea as to which system to start at. I am pretty sure you may have a vacuum leak though judging by the way you described how it started. Spray brake cleaner on every single place you might think it is leaking starting at the intake manifold. You will know there is a leak because the idle will change slightly. I would also back probe that sensor and check voltage at the map sensor to fully determine if it is faulty like Rhinoman stated. That will give you definitive proof if there is an issue with it. I am not sure the voltage it should have a service manual would be the best bet to find that info which I am sure other could chime in on. you might even be able to get it off this site for no cost just dig around a little bit.
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Old 11-20-2014, 07:22 AM   #10 (permalink)
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Quote:
Originally Posted by digidoggie18 View Post
However Since this is an OBD2 vehicle which it should be because it is a 2007.
It depends on what market the vehicle was built for, if its a Euro model then it will be EOBD, if its a general export model then it will be OBD1.
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