Teacherlife21

Weird running problems

Recommended Posts

Hey guys so bought my 3rd subaru other week. Its a 57 hatchback impreza. Duel mapped by Andy Forrest.

Soon as i took it through the 40 mile drive home i noticed a the throttle needle bouncing around a tiny bit and some hesitation along the way. And a more noticable when i eased off the gas it kept going 

Parked it up and took it out the next day and it started to surge whilst holding throttle bit more noticeable around 3.5k 

Took it on a long drive and wow i was on the motoway and at 70 it was hunting like crazy and knocking and coughing and spluttering.. all this brought the cruise light on and the engine management lights

 

It eventually died on me and wouldnt start for about 15 mins.

 

Managed to limp it to the Subaru specialists, got it plugged in it said misfire 1234, 

Got it reset and was fine for a very small while then lights came on again. I booked it in to be looked at but when it was all tested the plugs were fine and all sensors ran spot on. I was recommended to have the map taken off and redone for just one map.

 

I drove it half way home and then all of a sudden the car wouldn't drive ove 2k revs and was backfiring and coughing like crazy it eventually died on me and wouldnt start again and had to leave it 15 mins. Then managed to limp it back to the garage..

 

Had fuel pump pressure tested- was ok 

The crankshaft sensor is seized in the oil pump so waiting on that. 

 

Has anyone experienced any of these issues its really annoying especially when you lift your foot off the throttleand the car keeps accelerating and it randomly revs ad oc 

 

Cheers 

Share this post


Link to post
Share on other sites
 

Could check throttle position and maf sensor .

if it's a wrx? Also That the tgv's are working correctly .

What fuel are you using 99ron ?

Share this post


Link to post
Share on other sites

Yes bud wrx.. running V power as it was mapped on that.. its so hesitant its ridiculous.. bit mythed that the ecu hasn't picked anything up other than misfire 1234.. 

Share this post


Link to post
Share on other sites

Sometimes if the tgv's solinoids stick they can cause the flaps to stay shut ,in turn starve air and give a misfire. 

If it's running a oil'd cone filter or inner wing induction kit the  maf 's can get dirty . Cleaning with brake cleaner, waiting for it to dry ,refitting and clearing ecu codes can sometimes help .

Share this post


Link to post
Share on other sites

Tbh I've never owned a scoob with tgv's or worked on one with them lol .

but think it stands for something like "tumbler generator valves"  and they're supposed to "tumble"the air into the engine helping to mix the air and fuel for better emissions on cold start .

Classics and newage sti's don't have them and most aiming for high hp just delete and map them out .

Tbh my newer scooby spec isn't up to scratch, so don't know if your version definitely has tgv's but do know that they can cause misfire symptoms without tgv codes . Hopefully it's just a sticky solinoid mucking with the mixture and nothing too serious  

Share this post


Link to post
Share on other sites

Its not anything serious as its very intermittent.  Engine is fine no smoke. Oil clean all levels fine its just a sensor making it run like an absolute pile of junk. More annoying than anything

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.

Loading...