Vehicle & Technical > Discovery

v8 only firing on 7 not 8

<< < (2/4) > >>

disco-v8:
ok this might not be the answer to your problems, but after a good sort out on all my engine conponents, i forgot to plug in the air flow meter (which is atattched to the air pipe to the air box) and it seemed to be running on 7 cylenders aswell, but it was actualy running on all 8.... it must have been running a crap mixture....... it also spat out alot of black crap from the exhaust

asoon as i plug it back in it ran sweet as a nut

if there is a way you can test it then might be a good place to look

hope this may help

Range Rover Blues:
If you get really [!Expletive Deleted!] off with it I'm up in Sheffield.  Time's a bit precious at the moment though so PM first if you are getting real stuck.

abooth2k:
If its missing on both gas & petrol it can only be either spark or compression; you can tell which cyl it is (this may not be a recommended technique, but it works for me) when cold, start the engine up, and touch each branch of the manifold, one is likely to be noticably colder than the other NOTE ** ONLY DO THIS FOR ABOUT THE FIRST 10 SECONDS WHEN THE ENGINE IS RUNNING!! ** or a slightly more technically advanced way is one of those fancy infra red thermometer thingys, fingers work for me tho!! once you've diagnosed which cylinder it is, swap a plug with another cylinder and see if it helps, if not, as you say, standard plugs, ht leads, dissy cap, rotor arm, as its a 3.5 i am pretty sure they stall if you disconnect the air flow meter as suggested by another poster, however this can affect 3.9 (the system drops onto "limp-home" if it detects a fault such as a missing air flow meter...)

Xtremeteam:

--- Quote from: "abooth2k" ---If its missing on both gas & petrol it can only be either spark or compression; you can tell which cyl it is (this may not be a recommended technique, but it works for me) when cold, start the engine up, and touch each branch of the manifold, one is likely to be noticably colder than the other NOTE ** ONLY DO THIS FOR ABOUT THE FIRST 10 SECONDS WHEN THE ENGINE IS RUNNING!! ** or a slightly more technically advanced way is one of those fancy infra red thermometer thingys, fingers work for me tho!! once you've diagnosed which cylinder it is, swap a plug with another cylinder and see if it helps, if not, as you say, standard plugs, ht leads, dissy cap, rotor arm, as its a 3.5 i am pretty sure they stall if you disconnect the air flow meter as suggested by another poster, however this can affect 3.9 (the system drops onto "limp-home" if it detects a fault such as a missing air flow meter...)
--- End quote ---

alright adam  :wink:

gtomo2:
Thanks for the heads up. will be having another look at it. got it running better with adjusting the timing. will try the cold manifold touch.
Thanks agin

Navigation

[0] Message Index

[#] Next page

[*] Previous page