Misfiring Vw Golf Mk4 Help!

**Crasher** · 04-05-2008,06:58 PM

The manifold is easy to remove, just order a new head to manifold and TB gasket first.

**Shleng** · 07-05-2008,12:52 PM

VW the best place to go for these parts?

**Crasher** · 07-05-2008,01:25 PM

Your local VW main dealer.

**Shleng** · 25-05-2008,03:54 PM

just to let ya know crasher, i think i have found the culprit for my misfire! i think that it is the coolant temp sensor! i have removed the connector and checked the connections. by doing this, my problem has only occured once in 2 weeks. i have ordered one of these connectors for a tenner so ill replace it to hopefully confirm this!

**Crasher** · 25-05-2008,05:02 PM

Extracting the pins and swapping them over is a very delicate process and you need a pin extrcator to do this. If you damage a pin, you are in the poo!

**rickrobbo** · 26-05-2008,05:04 PM

Hi, people keep mentioning Vag-com. Is it possible to get a free version of the software? I keep having to pester my local garage to clear fault codes!!

**Crasher** · 26-05-2008,05:22 PM

See forum user Eshrules for a cable.

**kevderby** · 27-05-2008,09:06 PM

hi there i had exactly the same problem last year with my golf gti mark4 w reg. i took it everywhere and no one cud solve the problem. after tryin many garages i took it for a service and at the time my car was making a whinnging noise. i asked them to fix it and wen they fixed that problem it also solved my misfiring and erational up and down revs. it turns out that in the sump there is a nozzel which sucks up the oil to go round the engine. some how this had become blocked. after they cleaned it the car performed brilliant up until now. although the garage said this should not of made any difference. now its happened again i dont know wat to think although its been ok for the last 8 months. iv checked everything again and thats my only idea. just wanted to share it with u guys and see wat u think. thanks everyone.

**AndySil** · 30-09-2012,04:00 PM

Originally Posted by Crasher

No that is totally insufficient. It needs to be removed and carefully cleaned internally with a stiff nylon brush and erosol carb cleaner. After, it MUST be readapted to the ECU in Basic Settings 04, main group 060.

Crasher
I have the same GOLF Mk4 AUM engine with the two fault codes showing (17545 and 17705).
The symptoms are not too bad. Engine falters a little when cold and maybe lacking a bit of power generally.
(Averages 34-38mph if driven carefully).
Would it be OK to clean the Throttle body with an ultrsonic cleaner to start with?

Thanks for any help.
AndySil

**Crasher** · 30-09-2012,09:13 PM

17545 is the fuelling being too rich which can be the tank vent valve, Air mass Meter (most likely culprit) and a failed lambda sensor and 17705 is a throttle body pressure drop which MAY be due to a dirty throttle body but there are many other causes such as air leaks. I have been going through hell with a 2003 Anniversary for the last three weeks, it was in such a mess it is hard to describe but one classic was someone had fitted an aftermarket direct replacement diverter valve but decided to do away with the vacuum operating solenoid system and plumb it straight into the manifold so when it was needed to be opened with a vacuum, it was being forced shut with pressure-nice one! So far we have rebuilt the entire vacuum/boost management control system with three new genuine pipe sets, fitted a new Air Mass Meter, rebuilt the completely wrecked turbo (ingestion damage and oil starvation bearing/seal failure), second hand exhaust manifold to replace the cracked one (all three bolts were lose and the gasket half missing), taken out the Golf 5 FSI spark plugs, reinstated the MAP sensor back into the intercooler and replaced the one tie wrapped and glued into the boost hose, replaced all the crank case ventilation system hoses and pipes, fitted a new N75 valve, ordered a new air cleaner to replace the cone filter which killed the already new genuine AMM and left the SAI system sucking in dirty air, replaced all the missing hoses for the secondary air injection system, cleaned the ditched throttle body, replaced the missing cam cover vacuum reservoir and bracket, removed the sump to replace it (stripped drain thread) and found it full of debris and that the pick up pipe had the tea strainer rammed through plus a few other small jobs such as welding up the exhaust centre bracket and re-attaching the heat shield and we still have to deal with the butchered lambda wiring and broken rear axle mounts. I would love to know who has been working on it.