5 replies to this topic

[Uncle Boost]

Long story short-
2000 S80 T6 Obtained Cheap...
165k on the clock....
Was diagnosed as having BHG and disassembled by a local shop not privy to Volvos.
Received car disassembled with all the parts in a box.
Got Cyl head cleaned and surfaced, new stem seals etc. Cleaned block, installed head, torqued, Cams Timed, Engine runs but not like I suspect it to. 120 psi compression throughout all 6 cyls and 125psi in cyl 6.
Engine has skip to it @idle. Removing the coil connector while engine is running from Cyls 1-4 and 6 severely effect the idle but Cyl 5 has no effect like its a Dead Cylinder. But I have mentioned it has 120 psi. I've checked the Coil and have swapped several coils and spark plugs (which it has those 4 prong platinum plugs which run like crap in my 850 R) to no change...I have also tested the Injector which also is working. This beats all I've ever seen...NO CEL, or other alarms (Except when I remove connectors codes pop up, and I clear them) Has anyone ever seen an issue like this? Good compression, all the necessary vitals but not effect when you unplug the Coil while the engine is running like the other 5 cyls do. What else could it be? Thanks

-= UB =-

[Rod'sT-5]

Possibly a vacuum leak? When you checked the injector, did you have it out to check the flow? If not, swap it with the one next to it and see if the miss follows.

[Uncle Boost]

Rod, on 15 January 2012 - 12:30 AM, said:

Possibly a vacuum leak? When you checked the injector, did you have it out to check the flow? If not, swap it with the one next to it and see if the miss follows.

I had the Fuel Rail pulled with ALL the injectors, unplugged all injectors except #5. When my helper turned the key on, the injector sprayed into a bottle I had made up...good looking pattern I checked each one and they all have the same pattern. If it were a Vacuum leak it would skip all the time..which it does so to speak, but I notice when I pull the coil connector 1 at time for each cyl the engine almost stalls...but when i pull #5 it does absolutely nothing..no effect..like it doesn't exist!!.. Weird.. But I have good compression, spark, and Fuel....

[Pops Racer]

WE are puzzled why any one would buy one.

[Ihatespeedbumps]

Do you consistently get a misfire code for #5?

[Uncle Boost]

Ihatespeedbumps, on 15 January 2012 - 02:57 PM, said:

Do you consistently get a misfire code for #5?

The only time I get a Misfire code is when I pull the connector to the coil while its running.. no change in engine sound or vibration though..

Pops Racer, on 15 January 2012 - 07:23 AM, said:

WE are puzzled why any one would buy one.

hahaha..i paid less than 1 payment for someone making payments on one...