|
Post by autopart159 on May 25, 2013 17:41:10 GMT -5
hi i have a Subaru justy 1988 i have just done an engine rebuild on it and now it has developed a few problems 1 it sounds like it is running rich and wont rev probably 2 mpg is very poor 3 for some reason when i turn the engine off it will continue to run for a few second 4l loud backfires when turning engine off
if any one could help it would be much appreciated
|
|
|
Post by blacklight on May 25, 2013 18:02:04 GMT -5
Sounds like a defective anti-dieseling switch. It's located on the carb float chamber.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 25, 2013 20:14:56 GMT -5
Yeah, anti-dieseling switch is either not working or your timing is off.
My guess is the timing since you have those other symptoms and recently rebuilt the engine.
If it were just the anti-diesel switch you would have run-on after shutting off the engine but not much else.
|
|
|
Post by autopart159 on May 26, 2013 6:17:30 GMT -5
hi thanks for the replys i have checked both the timing and the anti dieseling switch and both seam ok i will try to get a vid of the engine running to see if it helps diagnose the problem
|
|
|
Post by autopart159 on May 26, 2013 7:36:21 GMT -5
i just used the gunson colure tune and the flame was a yellow blue so just thinking its running rich maby a worn jet or somethink
|
|
|
Post by Armageddous on May 26, 2013 12:59:33 GMT -5
First off, what was done in the rebuild? I'm assuming it ran relatively well before it was rebuilt?
Terry
|
|
|
Post by autopart159 on May 27, 2013 11:15:17 GMT -5
hi there it was running relitivly well but still backfired now and then the rebuild was full engine out of car head off pistons out inspected crank shells
|
|
|
Post by jamesy42 on May 27, 2013 16:42:48 GMT -5
Hi. Have similar problem. Sorry dont want to hijack the thread. Revs high on start auto choke. Calms down to 600 rpm. Stutters and lumpy driving. On acceleration fails to pick up immediately. The rocker gasket needs replacing. Am told that this is idle, mixture and timing, carburettor problem or hopefully just adjustment. Lots of garages i know locally (Redhill, Surrey, UK) shake there head after taking the pee out of the car and say its gonna cost you plus parts. I want to fix it myself or try to adjust it myself. Any advice on plan of action, or Justy owner Surrey, south London, Gatwick area? Cheers
|
|
|
Post by Armageddous on May 27, 2013 20:39:20 GMT -5
Both of you need to check the basics and get back to us. Are you absolutely sure the cam shaft timing is correct? Are the back fires in the exhaust or in the intake (shooting out of the carb)? What was replaced when the engine was rebuilt? You never mentioned why it was rebuilt..
Terry
|
|
|
Post by autopart159 on May 28, 2013 6:46:08 GMT -5
hi there i rebilt the engine as it was pissing oil every where i replaced all seals gaskets relaped the valves and cleaned the ports deglazed the cylinders and cleaned all the oil and grease up
also when reveing it backfires through the carb and when i turn the engine off it backfires through the exhaust
the timing is correct i checked using two methods one timing marks on crank and camshaft two put number one piston at tdc and looked at the rockers for valve over lap
i have done a compresion test and it seams im geing
cylinder 1 11 bar dry 12 bar wet cylinder 2 10 bar dry 11 bar wet cylinder 3 11 bar dry 12 bar wet
hope this helps
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 28, 2013 14:01:37 GMT -5
also when reveing it backfires through the carb and when i turn the engine off it backfires through the exhaust If it's doing this and the static timing is set correctly then either you're disty is installed 180 degrees off or the valve lash is so far off that the valves aren't seating correctly but that's remote since you're getting engine run-on. It still sounds like a timing issue though. Have you checked the timing with a timing light?
|
|
|
Post by autopart159 on May 28, 2013 15:43:45 GMT -5
timing is fine i put a small mark on the dissy and the head so i could line it up to the setting that was running fine i know i should use a strobe again but its one of the pieces off equipment i don't have also i took the justy to work today and it cost about £20 - £25 of fuel to do 45 miles
|
|
|
Post by autopart159 on May 28, 2013 17:00:32 GMT -5
|
|
|
Post by blacklight on May 28, 2013 19:33:58 GMT -5
Have you checked the valve lash? Be sure to do so.
|
|
|
Post by autopart159 on May 28, 2013 20:04:51 GMT -5
hi there i did the clearances when i put the engine back in but i will check them tomorow
|
|
|
Post by Armageddous on May 28, 2013 23:25:14 GMT -5
By that video I would say either your firing order is wrong or you messed something up in the engine.
Terry
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 29, 2013 0:44:26 GMT -5
Ok, that definitely runs different than I was visualizing. It's clearly running rich as you have assessed. Your carb needs a cleaning and rebuild. You probably have some passages blocked that are giving it an extra strong venturi signal and pulling in all that fuel. Also, your float probably needs adjustment and the needle and seat could use replacement...even if it looks like the fuel level is correct in the sight glass.
Beyond the carb, it sounds like there are some other issues, but it could just be that the microphone on the vid-cam was exaggerating the sound of the engine. It sounds like the engine in fighting itself a bit. Is that a 1.0 liter or 1.2? The video is a little dark so I couldn't tell.
Is the catalytic converter intact or did you gut it?
|
|
|
Post by autopart159 on May 29, 2013 10:10:02 GMT -5
its a 1.2 and its never had a cat since i have owned it i going to take the carb off again tomorow and strip it so i can get it cleaned in a sonic bath
|
|
|
Post by autopart159 on May 29, 2013 10:13:38 GMT -5
i have juat checked the firing order and its correct
|
|
|
Post by blacklight on May 29, 2013 10:29:52 GMT -5
A missing or gutted cat may be the problem. The exhaust is kinda tuned to have the cat's native resistance in terms of valve timing, so that may be worth checking out.
|
|