Thanks in advance for any help! S70 NOT v70

My S70 currently has 111,000 miles on it, was bought for previous original owner at around 85,000. They were an older couple who babied the car to my knowledge and took good care of it. My previous 94 850T had 0% taking off like a jet. With my v70 coming from a dead stop and accelerationg faster than normal I cant get above 4,000rpms. Once it hits 4k around 35mph it flutters between 3700 and 4100ish. Anyone know whats up? Volvo plugs replaced at 95500 and air filter is in good shape. Check engine is on and usually always is unless reset for inspection. Codes ive seen are its running too rich and front O2 censor. I dont plan on replacing the O2 censor. Care runs great otnerwise. Cleaned maf this summer.

 

So... you have problems causing the check engine light that you don't plan to fix but you want the car to run perfectly? Sorry but that isn't how it works.

 

All my volvos have had check engine light on and they run great. Do all my own work. I stated I dont plan to replace my front O2. Everyone ive talked to says the front O2 sensor does not solve the problem. Any help would be appriciated EST.

 

The check engine light comes on for a reason. Sometimes the car runs fine. Other times it doesn't. It depends on the cause.

 

No recommendations? Running too rich

 

What are the codes?

A bad oxygen sensor can cause it to run rich. Or another problem causing it to run rich can set oxygen sensor codes.

Thats why ignoring fault codes that pertain directly to the fuel injection system is not a good idea if you want the car to run right.

 

P0172

 

Thats a code for lean, not rich. A vacuum leak can cause it and your problem.

 

P0171 is system to lean P0172 is system to rich. Going to go over all vac hoses

 

No, its not. Thats why I don't use generic codes. Good luck.

 

What do you recommend I use? I use the OBII scanner

 

Autozone and most parts places will scan for free.

You really should fix issues as they come up. Letting codes go because the car runs ok is not a good idea. Usually, when the check engine light is on, the engine is running preset engine conditions. If nothing significant is wrong, you may not know it. but as soon as somethign else goes wrong you end up with a poor running engine and then you are tyring to dianose multipole issues to resolve it.

If you are getting a lean engine condition, look for vacuum leaks. Check the J hose in the back - common. If you find the vacuum hoses in the engine compartment dry and crumbly, you may wnat to think about replacement.

 

Whatever you're using to scan with is fine. But generic codes are not always what they seem.

The J hose won't cause a fuel trim code, it will cause an evap system leakage code.

 

So it looks like the codes are P1171 and P0102. Could the MAF possibly be bad and is causing the fuel trim code? Also I erased the codes, when I went to leave work the car was running not so hot. I would step on the gas and it would hesitate then regain power and so on. After a few minutes the car returned to normal

 

P0102 Mass or Volume Air Flow Circuit Low Input OBDII Engine Light Trouble Code | Engine-Codes.com
- You can see that is a mass/volume flow issue.
OBD Code P1171- what does it mean?
- More info and a very good write up.


I think you can see the common thread of the MAF or intake leak as the likely culprit.

 

What happened to the P0172?