Injectors

1. Agent_Orange Frequent Poster Joined: Jun 2006 Posts: 747

   #1 19th August 2007, 18:45

   Hi,
   What do dodgy injectors sound like? Hunted around on FAQ and can't find anything.
   Engine sounding a bit noisy lately (diesel-ish!) and get a strange groan noise when I back off and revs pass down thro 3k rpm. No not me groaning, from the engine! Got no timescales, can't remember when noise started.
   Got a new down pipe last month - garage told me it could be resonating?..
   
   Neil
2. Predator_R32p Super Moderator Joined: Mar 2003 Durham (England) Posts: 37932 1. AX 2. Mk2 Saxo VTR 3. MK4 R32 DBP

   #2 19th August 2007, 19:53

   is it running ok, not misfiring??
3. Agent_Orange Frequent Poster Joined: Jun 2006 Posts: 747

   #3 19th August 2007, 20:40

   Running a bit odd perhaps. It seems like one of those things that's creeped up on me almost. Maybe struggling a bit at tick-over. Justs sounding loud and maybe a bit rough to me. 87k and regularly serviced.
4. Predator_R32p Super Moderator Joined: Mar 2003 Durham (England) Posts: 37932 1. AX 2. Mk2 Saxo VTR 3. MK4 R32 DBP

   #4 19th August 2007, 21:19

   could be worth a compression test or get it on the diagnostics mate
5. devilsadvocate Saxperience Post Whore Joined: Dec 2006 Maidstone Posts: 8210 Golf TDI

   #5 19th August 2007, 21:40

   As pred said it could be missing, hence the diesel-ish sound. Take it to a garage and they will be able to tell instantly if it is missfiring. Again as pred said you will need a compression test to be 100% sure.
   
   If it is missfiring it could be many things:
   
   injectors
   Coil pack
   sparkies
   head gasket
   valves
   
   could go on forever :/
6. Tobs Saxperience Forum Bum Joined: Dec 2005 London Posts: 3416

   #6 19th August 2007, 22:06

   missfiring has so many different anwsers it could be (just let you know that )
   
   just try dianos the fault
7. Agent_Orange Frequent Poster Joined: Jun 2006 Posts: 747

   #7 20th August 2007, 20:34

   Also done a v.v.v.v.strange thing (that 1st few times I convinced myself it was me touching throttle by accident, but now know for sure it isn't!!), the Engine when cold is somehow blipping throttle and revving engine like some sort of poltergeist! Does it randomly even when driving or stationary?! Only up to 2k rpm ish...
8. Agent_Orange Frequent Poster Joined: Jun 2006 Posts: 747

   #8 20th August 2007, 20:35

   Oh Aye,
   And New coil pack, alternator, sparkies in not so distant past...
   Hmmmm
9. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

   #9 20th August 2007, 20:59

   when you say dodgy injectors there are only 2 main things that go wrong with them which is not opening and closing.. and not flowing due to a partial or full blockage
   
   you can do the screw driver trick to listen to the injector and hear whether it opens and closes...
   
   for blockages you need to check the flow