Toyota - 4runner :: 2007 - Ammonia Smell From Exhaust


Apr 8, 2012

I drive a 2007 Toyota 4Runner. Recently the weather has been nice enough to drive with the windows open. I've noticed a very strong ammonia smell from the exhaust - so strong at times, that I have to roll up the windows and use the a/c. I use Shell gas with no ethanol, but it has a nitrogen additive. Is it the gas I'm using, or is there something wrong with the vehicle? It's definitely ammonia, and I can only smell it while I'm driving.

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Steps taken:

Replace Battery
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Here is why I'm having a hard time.

1. I like VW's
2. MPG / Cost for gas is actually LESS for the 4runner... no premium, 4motion nets 17mpg avg - 4runner nets 16mpg avg (I drive 50/50 city highway).

The roads where I live are HORRIBLE - 1ft deep potholes are normal in the city, and unavoidable, expansion joints rise up to 4" at times- which feels like hitting a damn log.

I wrench my own cars, I've never gone to a mechanic or dealer ever. Had a mk2 gti, mk2 jetta, mk3 vr6 gti, a mk3 cabrio, and a mk4 jetta 1.8t in my past. Ive done timing belts, CV's, wheel bearings, control arms, struts, rebuilt heads. BUT- the Passat looks to be a complete PITA to work on (insane timing belt procedure, 8 front control arms, TCM water rot issues, etc). The 4runner appears on surface- to be much easier to wrench on - I could be wrong. I do have a VAGCOM, which supports a bit on the VW.

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What is the location of the MASS AIRFLOW SENSOR, AND THE MAIN COMPUTER...

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Toyota - 4runner :: 1998 - Grinding When Trying To Shift Into 4lo

I have a 98 toyota 4runner. Limited, automatic transmission, 4wd, 6cly. 3.4L. Recently my 4runner was towed and after picking it up from the impound lot I went to test the 4wd. This model has a separate shifter for 4wd with an on the fly button which you press to engage 4hi. Well, when I went to test it the 4wd the light did not come on and I felt no "clunk" as I normally do when engaging the 4wd, (this is even after driving a few feet.) So I went to test the 4lo. I put the transmission in neutral and pushed the 4wd shifter forward to the neutral position as I tired to go one more to the 4lo position it began producing a horrible grinding sound. I didn't push the shifter all the way forward for fear of further damaging something so I went to put it back into 4hi and again this horrid grinding sound. Basically the 4runner was stuck with the transfer case in neutral? It wouldn't even go into park with out making this horrible sound, so I had to shut everything down and put it back into park and hi mode. When I turned it on again I tried it again and still the same result.The 4runner works just fine in 2wd. And eventually the 4wd light came on after driving a few blocks with the button pressed although, I'm not sure the 4wd was even engaged because I never felt the "clunk." It is still grinding when trying to shift into 4lo. Fluids are changed regularly and it is very well maintained. It has 228XXX miles.

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