latif Posted December 15, 2006 Report Share Posted December 15, 2006 hi all gt a 96 4.2 last night car started to misfire . was parked up waiting fo a friend with engine running. al of a sudden car started to shake . cat light started to flash. gave the engine a rev and got some misfireing. today pluged in vag com . came up with cylinder 4 misfire. removed n.o 4 coil and plug .plug was soaked in fuel. decided to swap n.o 4 coil and plug with n.o 1 coil and plug. started car and same thing was happening ,misfire on n.o 4 cylinder. removed other coil plugs one at a time and found engine rpm would drop but nothing on n.o 4 cylinder . decided to do a compresion test on cylinder n.o 4 . got arround 150 psi .cant be a burnt valve . next checked coil plug for power . 3 wires in plug . got a positive and negative but in the third wire nothing not sure wat to do please help thanks latif Link to comment Share on other sites More sharing options...
latif Posted December 16, 2006 Author Report Share Posted December 16, 2006 can this be a ecu problem? Link to comment Share on other sites More sharing options...
PsYcHe Posted December 16, 2006 Report Share Posted December 16, 2006 Have you traced the cables from the No. 4 Coil? Could be a broke cable along the line somewhere. Link to comment Share on other sites More sharing options...
latif Posted December 16, 2006 Author Report Share Posted December 16, 2006 checked the wires ,no broken wires Link to comment Share on other sites More sharing options...
latif Posted December 16, 2006 Author Report Share Posted December 16, 2006 were is ecu located? dose the ecu have 1 multi plug or more? Link to comment Share on other sites More sharing options...
cruiser647 Posted December 16, 2006 Report Share Posted December 16, 2006 How about the injector? Could it be slightly blocked??? Do you get a spark on number 4? Link to comment Share on other sites More sharing options...
Ska Posted December 29, 2006 Report Share Posted December 29, 2006 ecu is in the black box on the rhs rear (facing engine) of the engine bay Link to comment Share on other sites More sharing options...
IT_S8 Posted January 22, 2007 Report Share Posted January 22, 2007 What was the outcome to this? - I have *exactly* the same problem on my 1998 S8... In my case its cylinder 2 misfiring, then cylinders 4 and 7 go out.... Switch off for 15 mins, switch on and its ok for another 400 miles or so and it does it again.... Very strange.... <VAG COM> Control Module Part Number: 4D0 907 557 N Component and/or Version: 4.2L V8/4V MOTR AT D01 Software Coding: 04373 Work Shop Code: WSC 02314 6 Faults Found: 16705 - Engine Speed Sensor (G28): Implausible Signal P0321 - 35-10 - - - Intermittent 17610 - Fuel Injector for Cylinder 2 (N31): Electrical Malfunction P1202 - 35-10 - - - Intermittent 16684 - Random/Multiple Cylinder Misfire Detected P0300 - 35-10 - - - Intermittent 16686 - Cylinder 2: Misfire Detected P0302 - 35-10 - - - Intermittent 16688 - Cylinder 4: Misfire Detected P0304 - 35-10 - - - Intermittent 16691 - Cylinder 7: Misfire Detected P0307 - 35-10 - - - Intermittent Link to comment Share on other sites More sharing options...
Muppet_man Posted January 29, 2007 Report Share Posted January 29, 2007 How are you trying to measure the third wire. Because you may be trying to get a voltage or eart when thats not what it does. Have you compared it with a reading on the same wire on another injector to see what that gives? Cheers Link to comment Share on other sites More sharing options...
jamesn Posted February 7, 2007 Report Share Posted February 7, 2007 Had a similar problem with mine - replaced fuel pump relays and solved the issue. Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now