MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: wilsy_ on August 02, 2015, 05:44:23 pm

Title: Is it Normal for car to run badly after Decat before map?
Post by: wilsy_ on August 02, 2015, 05:44:23 pm: So I fitted my BCS decat yesterday with the intention of going stage 2 in the next week or so.

As expected the engine light came on, but the car is also running a bit strange. Under 3000 revs it almost seems to be like shaking?

I scanned for fault codes and it came up with 5? Are these all normal for when fitting a decat? I feel like they arn't!! :sad1:

00305 - Fuel Consumption indicator signal - sporadic 002 - lower limit exceeded
00768 - Rear Heater core temp sensor (G154) - sporadic 002 - lower limit exceeded
00769 - Coolant temperature sensor at engine outlet (G82) sporadic 002 - lower
00770 - Coolant temperature sensor at radiator outlet (G83) sporadic 002 - lower
00771 - Fuel Level Sensor (G) sporadic 002 - Lower limit Exceeded

Thanks in Advance!
Ryan
Title: Re: Is i tNormal for car to run badly after Decat before map?
Post by: xjay1337 on August 02, 2015, 06:34:18 pm: "My mechanic changed my brakes and now the engine developed a mis-fire"

None of those codes are related to the decat pipe.

I had absolutely no issues when fitting my decat pipe aside from an engine light which came on about 2 days later.
Unless your mechanic completely bodged the fitting and broke all of the other sensors or left something unplugged. Literally you only need to undo the 4 bolts on the downpipe and a few under the car :) and the lambdas !
Title: Re: Is i tNormal for car to run badly after Decat before map?
Post by: Dan_FR on August 02, 2015, 06:59:39 pm: Problem is you don't know what codes were already there. Clear them all and see what comes back.
Title: Re: Is it Normal for car to run badly after Decat before map?
Post by: wilsy_ on August 03, 2015, 09:54:30 am: Quote from: Dan_FR on August 02, 2015, 06:59:39 pm
Problem is you don't know what codes were already there. Clear them all and see what comes back.

Quote from: xjay1337 on August 02, 2015, 06:34:18 pm
"My mechanic changed my brakes and now the engine developed a mis-fire"

None of those codes are related to the decat pipe.

I had absolutely no issues when fitting my decat pipe aside from an engine light which came on about 2 days later.
Unless your mechanic completely bodged the fitting and broke all of the other sensors or left something unplugged. Literally you only need to undo the 4 bolts on the downpipe and a few under the car :) and the lambdas !

Thats what I thought :sad1:

Car had no fault codes before, so the unrelated ones must be coincidence, or something has got hit/broken when fitting the exhaust. The two lambdas where the only sensors removed, and they been fitted back correctly.
Title: Re: Is it Normal for car to run badly after Decat before map?
Post by: th3_f15t on August 03, 2015, 02:21:43 pm: Check all the fuses and just double check all the sensors are firmly seated and clear from any debris.