1998 V70 Timing belt, cylinder head work 330k miles!

Post by **abscate** » 28 Nov 2016, 03:31

That's an Idle Air control valve fault. I think I would try find a used one at the junkyard and clean and swap,out. I don't think the IAC runs hot normally, either. I don't want have one on my 1999 so I can't compare.

5rivers · Post by **5rivers** » 29 Nov 2016, 20:45

Thanks for your reply, abscate!! I have switched out a few IAC valves from the salvage yard and I am getting the same code with each one. I can't imagine 3 or 4 of these valves are all bad, so I will begin to remove one vacuum hose at a time, clean them and replace. Maybe one is clogged. I did remove the vacuum tree and cleaned that out and replaced it and cleaned out the opening to the intake manifold for it. Maybe the small o-ring on the vacuum tree needs to be replaced. Will update as I move along.

5rivers · Post by **5rivers** » 07 May 2018, 09:25

Greetings all!
Once again, I am attempting to better understand my Volvo! It has been sitting for the winter and have put it back on the road - the problem is the codes! I am still getting 505 and either a 130 or 131. When I put this on the road after reassembling the cylinder head etc. a few years back, the 505 code kept reappearing despite having installed various IACV's. My question this time is about the monitors for I/M readiness. There are 10 according to my code reader and only 3 have the green check marks. I've driven the car about five hundred miles+ and have used super gasoline and initially some 'heet' to help with moisture. When I have checked the codes, sometimes those for the O2 sensors appear, sometimes they do not, but the 505 is either present or pending. The monitors that are INC (with the red X's) include CAT, EVAP, AIR, O2S, HTR, and EGR. Only once did the HTR and EGR come up green but are now red. Should I reset monitors to the factory defaults with my code reader OR ??? Need your help on this big time so the car can pass NYS inspection. Appreciate all your feedback!

Post by **abscate** » 07 May 2018, 10:40

Hello 5rivers - welcome back.

How good is that battery after sleeping all winter - did you keep it on charge? If the battery is marginal the ECU will forget its map and you will be always non-ready on a bunch of stuff.

You can have up to two monitors NOT READY in NY and still pass inspection - but the CEL can't be on.

5rivers · Post by **5rivers** » 07 May 2018, 16:26

Hi abscate - I had a feeling you would reply! Thanks! The battery did need to be charged once, then I kept it on a maintainer. I did the series of steps to eliminate the non-ready status of the many monitors on the Volvo today, (e.g., drive between 1500-2000 rpm for 5 minutes, then idle for 60 seconds, drive for 6 minutes at the previous rpm, then idle for 40 seconds, drive for 5 minutes at the same rpm as before, then idle for 70 seconds, brake hard from 4000 rpm to 1300 rpm, etc...). But the check engine light came back on once I parked the car and restarted it an hour or so later! There is another sequence of driving patterns that I could try - drive 20 minutes between 55-70 mph, then 20 minutes of stop 'n go driving. Not sure if that will work for my ole Silver jet, but I suppose it is worth a shot! My code reader does have an option of resetting factory defaults, don't know if it will work for the Volvo as I have not tried that yet. Appreciate any other suggestions you might have!

Post by **abscate** » 07 May 2018, 20:48

Everything but EVAP should go ready in 50 miles or so. What code is tripping the CEL?

Each time you reset the CEL you have Tom drive another50 miles for the monitors to go ready.

Engine slightly warm
No AC
Gas tank 1/2 full approximately
Start with warm engine, drive at least 17 minutes under 60 mph , then slow to stop and idle for 5

5rivers · Post by **5rivers** » 07 May 2018, 21:18

Thanks for your reply, abscate!
I believe the code tripping the CEL is P0505 - the idle air control valve, and then the front O2 sensor (code P0130) are the 2 codes coming up. I will double check the vacuum lines and hose connections to the SAS in the morning - that might be what is tripping the codes - based on another member's experience with monitor readiness! As mentioned previously, I have replaced the IAC about 4 times with used units from the salvage yard. The IAC in the car now looks relatively new - but still has some visible blowby residue. And then there's the minor exhaust leak (where the two pipes meet at about the middle of the car) that needs attention!

5rivers · Post by **5rivers** » 18 May 2018, 06:09

I hope this finds you all well and enjoying the wonderful outdoors!
I installed another IAC valve from the salvage yard, but it has not made any significant improvements in the idle issue my Volvo is having. I have driven the car as abscate recommended above, but nothing changed with the readiness monitors (and the CEL came back on) and I have driven at least 50 miles numerous times without any monitors turning green. Still have only three green and occasionally have two more, but those still red include the CAT, EVAP, AIR, O2S, HTR, and EGR. The last two (HTR and EGR) have turned green once again, but are now red. Any suggestions on what I can/should do next would be greatly appreciated! I can post some numbers from the code scanner if that would be helpful. Should I be inspecting all hoses and connections, again?
P.S. This may be a silly question, but what does HTR represent?

Post by **abscate** » 18 May 2018, 06:27

HTR is heated oxygen sensor. I didn’t think you have EGR on this car so that’s puzzling.

It could be if your heater on the Oxygen sensor is not Good it is preventing the others from resetting.

What is the status on oxygen sensors ? Are they known to be good?

Can you track down the fuse for the oxygen sensor heater circuit And check that, then check for 12 V at the sensor harness ? I’ll try to track down some threads on this here

5rivers · Post by **5rivers** » 18 May 2018, 11:41

Thanks for your reply!!
The O2 sensors were or almost new when I re-assembled the motor a few years back! I remember having issues with the car passing inspection before it broke down in the NYS Thruway. Replaced the O2 sensors then and I think that was enough to have it pass. That was in 2014; it could have been in 2013 when I had the sensors installed.

I am not sure where the fuse for the oxygen sensor heater circuit would be - should I follow the wires pre-connection?

Well, here's what I've done so far: removed the IAC valve and hoses, removed the accordion-type hose from throttle to air filter housing, removed the TPS, removed the throttle cable and vacuum tree. I wanted to see if the throttle plate was not closing enough based on the up/down repetitive motion of the idle (figured the throttle was sucking in too much air). Got out my flashlight and played with the throttle plate lever and sure enough, I could see light on the bottom of the plate. So I loosened the screws to the throttle plate inside the throttle, loosened the tiny bolt/screw attached to the intake manifold that determines where the throttle plate rests in the closed position. I had to back out that tiny bolt/screw quite a bit (of course, the screw broke off - it was rusted in place!). Not sure how it happened to be screwed in so far - could have been when I re-assembled the cylinder head et al a few years back

! Anyway, the car now idles at 950 RPM! How about that!!! I am SOOOOO happy - progress for sure!

Next, I have to take the car for a ride to see if/when the CEL comes back on. If so, then take it on one of those drive cycles to see if the monitors turn to ready/green! I will keep you all posted!

1998 V70 Timing belt, cylinder head work 330k miles!

Re: 1998 V70 Timing belt, cylinder head work 330k miles!