Misfiring 3000revs and above

G

Goldsqeegee

Member
Hi All,

My 1.4tdi saga continues, but, I'm still hanging in there....

1.Car misfires between 3 n 4k revs

2. Turbo cuts out when giving it some beans, turn off n on, back again, also getting engine overun when revs go over 4.5k

What I've done to attempt to solve this is, replaced all hoses from n75 to turbo, replaced turbo, re crimped the connectors on injector loom.

What else can I do?

Got no error codes coming up on obd.

HELP ??

Sunday, got on the top of the line Bosch diag box, courtesy of AA !!

Patrol found the following fault code/s:

System : Engine control 1 - 69U / Diesel EDC 15P462D -
Boost pressure control. Error Message : Above control limit.463A -
Engine control unit disabled. Error Message : .469C -
Valve for unit injector, cyl. 3. Error Message : Circuit defective.469A -
Valve for unit injector, cyl. 1. Error Message : Circuit defective.
Engine Oil Level Ok.
Coolant Level Ok.
 
Last edited:
dj_efk said:
Try a VCDS scan instead.
Click to expand...
The OBD protocol only covers the very limited range of error codes, which all car manufacturers have agreed to. Each car maker has many car/engine specific error codes, which only a dedicated reader, (such as VCDS or OBD Eleven for VAG vehicles), will collect, and most importantly, add a descriptive label to.
Mac
 
PlasticMac said:
The OBD protocol only covers the very limited range of error codes, which all car manufacturers have agreed to. Each car maker has many car/engine specific error codes, which only a dedicated reader, (such as VCDS or OBD Eleven for VAG vehicles), will collect, and most importantly, add a descriptive label to.
Mac
Click to expand...
It was scanned with a proper bosch diagnostic tool at the garage when they put the turbo in...
 
In a word. INTERCOOLER. Probably suffering from the notorious end cap cracking and seal spitting issue. Check or replace the fuel and air filters. Could be the tandem pump on its way out.
 
audifan said:
In a word. INTERCOOLER. Probably suffering from the notorious end cap cracking and seal spitting issue. Check or replace the fuel and air filters. Could be the tandem pump on its way out.
Click to expand...
Intercooler, and rad is brand new... All pipes coming off it are new ?
 
That then takes me to fuel and air filters or a worn tandem pump. Why a K&N and what fuel filter? Always fit OEM filters.
 
Was the turbo new or second hand and a GENUINE A2 unit? Really do need a VCDS scan although that will not show filter issues or tandem pump wear nor an injector loom issue unless really bad. It will however tell us it it is an over boost or under boost condition. They did remove the outer packaging from the air filter I presume??
 
audifan said:
Was the turbo new or second hand and a GENUINE A2 unit? Really do need a VCDS scan although that will not show filter issues or tandem pump wear nor an injector loom issue unless really bad. It will however tell us it it is an over boost or under boost condition. They did remove the outer packaging from the air filter I presume??
Click to expand...
Turbo was off my mates A2, working 100% fine, the air filter I checked nyself, it's spotless.
 
VCDS or maybe some OBD readers will be able to see boost pressure, air flow, sensor readings and what not. Seems like where you're at is needing to record some of those stats when the turbo wanders off for a bit and then comes back.

While air intake is important, the exhaust that drives the turbo hasn't been mentioned above. Out flow from the engine is /can be just as import and ensuring the in flow is sorted. So is the exhaust all right, are the exhaust sensors giving the right readings?

They might be sending an incorrect reading and messing with intake values the ECU uses causing the engine to misfire. As the values might be in range, no error will be recorded.
 
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