Volvo S70 stalling out! HELP! Topic is solved

white S70 · Post by **white S70** » 03 Jun 2005, 12:21

My 98 Volvo S70 stalled out and my check engine light came on. There is a rattle when it is started, sounds like it may be coming from around the catalytic converter. Anyway, I ran a scan on the check engine light and it gave me two trouble codes P0103 (mass or volumn air flow circuit high input) and P0171 (system too lean). Could a faulty O2 sensor be the blame or a bad catalytic converter or both. Please help!

Jot · Post by **Jot** » 03 Jun 2005, 18:50

How many miles on the car? When was the fuel filter changed? an O2 sensor would show as a code number.You can check for an air leak on a cold engine with a unlit propane torch. If the rattle is present on startup EVERY time it is probably a bad cat

White850Turbo · Post by **White850Turbo** » 04 Jun 2005, 05:58

Sounds like the classic symptoms of MAF failure.

white S70 · Post by **white S70** » 06 Jun 2005, 06:46

Jot wrote:How many miles on the car? When was the fuel filter changed? an O2 sensor would show as a code number.You can check for an air leak on a cold engine with a unlit propane torch. If the rattle is present on startup EVERY time it is probably a bad cat

It has 114,000 miles and we just bouhgt the car. Please give me details on how to do the propane check on a cold engine.

Jot · Post by **Jot** » 06 Jun 2005, 07:37

With a cold engine start it and with an unlit propane torch (gas on) move the torch around the engine and hoses, if there is a vacumn leak the engine will speed up. The usual symptom of the MAF failure is running rich not lean.

white S70 · Post by **white S70** » 06 Jun 2005, 07:52

Dumb question! Do I look for that vacuum leak and fix it or are talking about replacing the MAF sensor? Sorry for the dumb %*# question. Thanks JOT.

Post by **matthew1** » 06 Jun 2005, 10:22

Jot's method finds vacuum leaks, which are simpler to fix and much less $ to fix.

white S70 · Post by **white S70** » 07 Jun 2005, 07:04

I tried the propane torch method last night and started my engine while cold and the engine never accelerated at all. I'm at my ropes end! Looks like I may be headed for the dealer. Thanks for everyones help though.