Sign in to follow this  
kklepack

99 V70 R rough idle after warm up and stalls

Recommended Posts

Just got 1999 V70R with 212k and car starts/idles fine for the first 10-15 min. and then begins to stumble/idle rough. Runs fine above 2000 rpms. No codes in on VIDA scan, also It has new XeMODeX ETM installed by previous owner and it was programmed by the dealer.
Looking for help and suggestions and idea how to tackle this problem.

Share this post


Link to post
Share on other sites

We probably need to start with the basics here. Do we have any air leaks? How is our fuel pressure? Any history on the fuel pump relay?

Share this post


Link to post
Share on other sites

Sorry, I've should add I will be working on replacing vacuum lines next week since it is 20yrs old car, fuel pressure seems ok after pressing little nipple on fuel rail, Fuel pump relay has been replaced with one from the junkyard and same symptoms.more update to come.

Share this post


Link to post
Share on other sites

Someone suggested to replace ECT. ECT and thermostat has been replaced and no luck same symptoms. Re-scanned for codes and again no codes. Did XeMODeX ETM test by their flow chart troubleshooting and all passed. Perhaps MAF could be the issue? 

Share this post


Link to post
Share on other sites

Definitely make sure there are no vacuum leaks, that's going to be the best place to start.

Try unplugging the MAF, then starting it back up when it's warm. My top 2 guesses after vacuum leaks are MAF or ECT, but if you already replaced the ECT sensor that's probably not the problem.

Share this post


Link to post
Share on other sites
11 hours ago, bmdubya1198 said:

Definitely make sure there are no vacuum leaks, that's going to be the best place to start.

Try unplugging the MAF, then starting it back up when it's warm. My top 2 guesses after vacuum leaks are MAF or ECT, but if you already replaced the ECT sensor that's probably not the problem.

No love, same symptoms. when MAF is disconnected.  I will try to swap vacuum lines this weekend and go from there.

Thanks for advise.

Share this post


Link to post
Share on other sites

I doubt it is vacuum, or you would have issues at all temp ranges.  You could just spray some brake cleaner around the lines to see if the RPM changes.

I am thinking you may have a bad coil.  I had a similar issue that it wouldn't idle very well, but above 2000 RPM it seemed to run fine.  Once warm, try disconnecting a coil and starting the engine.  If that coil is good, it should run even worse.  If it runs the same, you found the bad coil.

 

Share this post


Link to post
Share on other sites

My cousin's car had an issue with that a while back, usually it felt fine above 2000 RPM with a dead coil. Swapped it out, ran perfectly.

Share this post


Link to post
Share on other sites
15 hours ago, Zappo said:

I doubt it is vacuum, or you would have issues at all temp ranges.  You could just spray some brake cleaner around the lines to see if the RPM changes.

I am thinking you may have a bad coil.  I had a similar issue that it wouldn't idle very well, but above 2000 RPM it seemed to run fine.  Once warm, try disconnecting a coil and starting the engine.  If that coil is good, it should run even worse.  If it runs the same, you found the bad coil.

 

Off the topic. Is the Techno Viking???

Share this post


Link to post
Share on other sites
6 hours ago, kklepack said:

Off the topic. Is the Techno Viking???

Yes it is.

Share this post


Link to post
Share on other sites

@Zappo and @bmdubya1190 I did coil test per your recommendation and car ran worst after unplugging one coil at the time.

 I was told that PO replaced the spark plugs and coils 10k miles ago.
One observation. after car wormed the temp gauge arrow stayed in the middle on the dashboard and the coolant almost reached to the top of the coolant tank . Is it normal ? Before replacing thermostat I drained 2 qts of coolant and when I re added the level stays above the MAX all the time

 

Also when car was choking/puffing after worm up is saw smoke coming out of dipstick, but glove test passed. PCV?

https://photos.app.goo.gl/XgrP7TsZghdPDh5b7

IMG_20200204_173701.jpg

Edited by kklepack
Links added

Share this post


Link to post
Share on other sites

Where does it sit when the engine is cool? I noticed yesterday that our XC90 V8 does that too, the level rises maybe an inch when hot. My V70R does not, though.

The smoke is likely from the PCV. I've had cars pass the glove test that still have a clogged up PCV.

Edited by bmdubya1198

Share this post


Link to post
Share on other sites
On 2/5/2020 at 12:43 PM, bmdubya1198 said:

Where does it sit when the engine is cool? I noticed yesterday that our XC90 V8 does that too, the level rises maybe an inch when hot. My V70R does not, though.

The smoke is likely from the PCV. I've had cars pass the glove test that still have a clogged up PCV.

Coolant level sits at MAX level.  Here is a short video how it runs.

 

https://photos.google.com/share/AF1QipMM4QCjXzqPzEFCgHHY1IWy6VD-oFlN-LAGEnSHK5bW1H0ubJNOKeeOnCTRuBD4FQ?key=eGFyZS1oZmZfdG5qZlEtbW0zcWh4eUxmRllrOW9B

Share this post


Link to post
Share on other sites

I wouldn't worry too much about the coolant level at this point.

It definitely sounds like it's down a cylinder though, but if unplugging each coil made it worse, then it's not the problem.

Share this post


Link to post
Share on other sites
1 hour ago, bmdubya1198 said:

I wouldn't worry too much about the coolant level at this point.

It definitely sounds like it's down a cylinder though, but if unplugging each coil made it worse, then it's not the problem.

Thanks, I'm going to work on PCV  and replace vacuum lines with silicon and see if it helps.

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this