Hi all, this is my first post so please bare with me. When I'm down-shifting to come to a stop the car stalls everytime. This would be in 1st gear, feet on the clutch and brake. I'm getting five codes:
PO172 system to rich bank 1
PO300 random/multiple cylinder misfire
PO301 engine misfire
PO303 engine misfire
PO304 engine misfire
I did a compression test and here are the results:
Cylinder #1 190
" #2 195
" #3 160
" #4 140
It doesn't appear to be good! Any ideas?
Wayne

 

leakdown test to pinpoint if its rings or a head gasket...im leaning towards a head gasket because its very rare to have rings go at the same time on cylinders right next to each other, if that's the case then it's not too bad...oh btw, how many miles are on this?

 

The car has 34,000 miles on it. Any possibility of a bent valve or a valve not seating correctly?
Wayne

 

Do you do any racing activities with your car and make a over rev mistake?
Looks like you touched some valves.

 

x2

you're miles are not that high, but definitely have feeling this is a blown head gasket.

 

Just got home and checked my messages. I'm going to have to do a leak down test to pinpoint the problem. Either way you look at it, seems like the head needs to come off.
Thanks for the input and any more suggestions will be great!
Wayne

 

X3, looks like mechanical over-rev has done some damage! bent valves look to be evident

 

mechanical over-rev is the most common cause of these symptoms. Are you the original owner or have you recently acquired the vehicle? Do you recall any over-rev?