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Discussion Starter · #1 ·
My car is a 2007 Suzuki Forenza, 5 speed manual transmission with 115,000 miles located in Alabama. Oil changes are done every 4000 miles. The only issue up to this point has been the low tire symbol that stays on all the time. About six months ago, I noticed an exhaust fume smell within the car whenever I came to a stop, such as at a red light. It has progressively become worse over time. I've taken the car to an exhaust mechanic who checked it thoroughly and stated that there was no exhaust leak. Researching the internet only turned up an answer of maybe the crankcase vent hose has cracked, but that was regarding a 2004 model. Any suggestions? :confused:
 

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Hello there. Do you hear any unusual exhaust noises when you accelerate or press the throttle in neutral? Like a "farting" sound, or ticking/popping? If so, it is possible you do have an exhaust leak. These leaks can happen in many different places in any car, so I couldn't tell you where it is without seeing/hearing it. You might try having someone else rev the engine while you stand and listen carefully with the hood open. Usually it takes some amount of load on the engine to hear a small exhaust leak so they would have to "dig in" to the throttle briefly and then let go a bunch of times.

Another possibility is like you mentioned that your PCV hose is broken and crankcase fumes are venting into the engine bay - they smell almost as bad as exhaust too. All models will have a PCV system with a hose, etc. The should be at least one, maybe two hoses that run from the valve cover to the intake piping/resonator. Check them for leaks, cracks, etc.
 

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Discussion Starter · #3 ·
Here's an update. It was not an exhaust leak. While getting an oil change at one of those 10 minute jiffy change establishments, the mechanic noted as he was changing the light bulb in the front light, that a valve cap was cracked and needed replacing. I asked if that could cause the odor, and he said yes. It cost $150 to fix.
 
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