Dam it!!! Error codes

[Biggwaukegan]

guys my check engine soon light popped on the other day:mad2:. So I shoot over to autozone and these 3 codes came up. :confused2:help me out......code p0420 code p1345 code p0430....any help would be great.

 

[Ojustracing]

420 and 420 convertor efficiency low bank 1 and bank 2
1345 Ckp/cmp correction(Distributor installed wrong possible)

John

 

[sasquatch094]

http://www.troublecodes.net/GM/

 

[Biggwaukegan]

the code website didnt help what else we got

 

[99ChEvY2Dr]

My Haynes manual says:

P0420 = Catalyst system efficiency below threshold, left bank

P1345 = Crank shaft position sensor/Camshaft position sensor correlation

P0430 = Catalyst system efficiency below threshold, right bank

Hope this helps!

 

[peterey2]

start at the first code present and work your way down.

 

[Biggwaukegan]

My Haynes manual says:

P0420 = Catalyst system efficiency below threshold, left bank

P1345 = Crank shaft position sensor/Camshaft position sensor correlation

P0430 = Catalyst system efficiency below threshold, right bank

Hope this helps!

yeah i think i got the crankshaft position sensor under control... i think. but what in the moly sht does the other 2 mean? low coolant? possibly a coolant leak?:nonod::cuss:

 

[peterey2]

cat converter check

 

[Biggwaukegan]

and how should I check that? my cats were new like a year ago? dual magnaflow cattys. how would I have my muffler dude check em? look for leaks or some ****?

 

[99ChEvY2Dr]

Haynes Manual says:

a) Connect a vacuum gauge to an intake manifold vacuum source.

b) Warm the engine to operating temp.

c) Note and record the vacuum reading at idle.

d) Open throttle until the engine speed is about 2000rpm.

e) Release the throttle and quickly record the vacuum reading.

f) Perform the test three more times, recording the reading after each test.

g) If the reading after the fourth test is more than one in-Hg lower than reading record at idle, the catalytic converter, muffler or exhaust pipes may be plugged or restricted.


HOPE THIS HELPS!

 

[Ojustracing]

The above test checks for restricted convertors. The computer is seeing that both of them are not working. Could they be plugged yes but both at the same time. Highly unlikely.

Putting my work hat on, I would adress the 1345 code before anything else. Has anybody had the distributor out or has anyone had the intake manifold off lately. I have had them WAY off(another shops mistake), I had a 4.3 with the distributor off more than 35 degree's. It still ran okay, it was advanced so for you could actually hear the coil making a hugh spark trying to jumo the gap. I spent 3 hrs trying to get that correct. If they off, they are a pain to get the last 5-20 degrees. but if this has been going on for a while it could of damaged both cats.

John

Ps I see you might of fixed the 1345 code, what did you DO or find wrong?

 

[Colabella7077]

Could be bad o2 Sensors if it's reading a low voltage. Or definitley a block in the pipe.