QuestionQUESTION: There seems to be compression in one of the cylinders after I cut the car off in about 5 seconds it will give a thud sound and also it has been sputtering while I have been driving and also giving the same kind of sound could it have to do with the engine breather box any help would be really appreciated
ANSWER: Alan,
Hard to say without hearing the sound and inspecting the car. Can you trace the noise? Do a crankcase pressure test see what that shows. If you pull the dip stick out and turn off the engine will it also make this sound? Now the sputtering while driving! The engine runs poorly also, do you have a check engine light on some codes? A coil going bad or spark plug?
---------- FOLLOW-UP ----------
QUESTION: Yes I got codes 1633 and 1132 the code book I have only goes to 989 would u give me the diagnostics on these codes please
AnswerAlan,
The codes you have read are not the manufactures codes they are generic ones that are not as specific as the Volvo ones. Might be better having a Volvo shop read the codes. However here is what I found about your codes. P1132 Front oxygen sensor. P1633 vehicle speed signal missing or absent. The H02S code maybe more of the runability issue depending on what the cause of the fault is. If I cross your code into the Volvo manufactures code here is what it says....
Diagnostic Trouble Code (DTC) Information
Condition
Probe monitoring begins after probe preheating diagnostics are complete. Diagnostic trouble code (DTC) ECM-280A is stored if there is a fault in the front heated oxygen sensor (HO2S) or its wiring causing the signal to deviate from its permitted range
The control module registers four different types of fault:
Signal too high The control module compares the front and rear adaptation values. A diagnostic trouble code (DTC) is stored when the values deviate by more than 3%. Note! The fault may be in the front or rear heated oxygen sensor (HO2S) circuit.
Signal too low The control module monitors the aging of the probe by checking its dynamics when switching between lean and rich mixtures. The diagnostic trouble code (DTC) is stored if the control module registers that the probe is operating too slowly.
Signal missing The control module monitors cross-induction from the probe preheating. Diagnostic trouble code (DTC) is stored when cross induction exceeds the permitted value.
Faulty signal A diagnostic trouble code (DTC) stored when:
the control module registers that the signal from the front probe is above 4.8 V for too long
the signal from the front probe does not deviate from [lambda]=1
the signal from the front probe is showing a lean fuel mixture while the signal from the rear probe is showing a rich mixture
the signal from the front probe is showing a rich fuel mixture while the signal from the rear probe is showing a lean mixture.
Condition
The rear heated oxygen sensor (HO2S) control is disabled
Three-way catalytic converter (TWC) diagnostic is disabled
Possible source
Signal too high:
air leakage in the exhaust system
short-circuit to power supply or ground in the signal cable (+) or supply cable for pump current
defective heated oxygen sensor (HO2S)
Signal too low:
the cable for calibration current and the cable for pump current are short-circuited to each other
open-circuit in signal cable (-)
open-circuit in cable for calibration current
defective heated oxygen sensor (HO2S).
Signal missing:
signal cable (+) and signal cable (-) short-circuited to each other
one of the cables for heated oxygen sensor (HO2S) preheating is short-circuited to the probe's other wiring
defective heated oxygen sensor (HO2S).
Faulty signal:
short-circuit to supply voltage or ground in signal cable (+)
short-circuit to supply voltage or ground in signal cable (-)
short-circuit to supply voltage or ground in pump current cable
short-circuit to supply voltage or ground in calibration current cable
open-circuit in signal cable (+)
defective heated oxygen sensor (HO2S).
Condition
malfunction indicator lamp (MIL) lit.
