Confused by my 1999 V70 NA

cal67 · Post by **cal67** » 23 Oct 2022, 15:30

Hello,
About a year ago while driving the car, it suddenly lost almost all power. I barely made it to work and then after work it would crank but not fire. I replaced the crankshaft position sensor and the car would start but still had no power. It has codes P0350, P0351, P0352, P0353, P0354, P0355, P1053, P1021, P1017 and P1026. Car will run and drive but very low power, won't rev. and barely gets over 30 km/h. If I clear the codes it will crank but not fire for a while until the codes come back at which point it will fire. I've checked for voltage at the coils and it is almost exactly battery voltage. Ground at the coils show good continuity. It has been sitting most of the last year just occasionally being started and run to keep the battery good. Car has a Xemodex ETM. I cleaned all the spark plugs, checked coil harness and grounds today and no difference. I hate to scrap the car but that's pretty much where I am now. Any ideas?

Post by **wizechatmgr** » 23 Oct 2022, 19:26

Have any known good coils? Sure sounds like they may be end of life. When was the last time the plugs were replaced?

Post by **wizechatmgr** » 23 Oct 2022, 19:29

Also try starting it with the MAF (connector by the airbox) disconnected and see if that helps any.

Post by **scot850** » 23 Oct 2022, 19:29

P0350-55 are all cylinder misfire codes.

P1053 -Engine trouble code

P1017 - Could be MAF failure

P1021 - O2 sensor error

P1026 - ETM sensor issue

I have linked a thread on a similar issue for you to read.

viewtopic.php?f=1&t=22539

Did you have the ETM rebuilt by Xemodex or was it in the car when you bought it? I would suggest contacting Xemodex help line.

MAF failure could be an issue. Try disconnecting it and see if the car will start and run. If it does, either the connector or MAF is bad. Bad news is MAF is now only available used or from Volvo.

Last possibility could be the fuel relay or pump. What fuel pressure are you getting at the rail? I would expect in the 50 psi + range for your car.

Neil.

Post by **rguzz** » 24 Oct 2022, 06:55

Not super familiar with 99's but all those codes will likely boil down to one issue, which is what the previous comments are I believe essentially inferring. Don't give up hope, maybe for that reason alone...when you figure it out might have been a relatively easy fix.

Post by **misha** » 24 Oct 2022, 16:18

Battery?

Post by **scot850** » 24 Oct 2022, 16:38

Misha has made a very good point and sometimes the simplest option is overlooked! 99- cars are very susceptible to low battery voltage. This will affect all the systems you mention.

Have your battery tested for cranking voltage. It may read over 12V, but when loaded it may not have the power to run with the power needed to power all the systems. Now whether the battery is at fault or a charging issue that will need to be checked.

It does not mean something else is not bad, but you have to start somewhere.

Neil.

cal67 · Post by **cal67** » 24 Oct 2022, 16:50

Thanks for all the ideas.
All coils were replaced about 3 years ago. Plugs about the same time. I did clean and regap the plugs but that made no difference. Xemodex ETM was in the car when I bought it. Xemodex web site seems down. I did go through their troubleshooting chart for the ETM when it was still up on the website and it showed no issues. I had tried disconnecting the MAF and it runs with no seeming difference. Is is possible that this is the sole issue or are the misfire codes another issue? Note that plugs were heavily carboned (black) when I removed them. Battery is a junkyard replacement that tested OK. Would a battery cause a problem if the alternator is charging adequately once the car is running? No ETS light at all.

rrres · Post by **rrres** » 24 Oct 2022, 18:41

Also, look into the o2 sensor error code. When my o2 sensor got fouled, the car ran like crap and I could feel the misfire during acceleration. Had hard starting. When I opened the hood, I could feel that the radiant heat from the engine was hotter than normal. If your spark plugs are fouled, then I assume the o2 sensor will also be fouled.

Post by **abscate** » 25 Oct 2022, 18:13

Would a battery cause a problem if the alternator is charging adequately once the car is running?

Yes. The battery has to supply a solid 12 volts even with the alternator running.