Das Forum von www.k-ue.de und www.1600i.de
Login Registrieren FAQ Mitgliederliste Suchen Das Forum von www.k-ue.de und www.1600i.de Foren-Übersicht

map sensor fault?

 
Neues Thema eröffnen   Neue Antwort erstellen    Das Forum von www.k-ue.de und www.1600i.de Foren-Übersicht » Technique - Technik
Unterschied HJS Kat fur 1200er/1600er Motor? :: Vorteile eines länger übersetzten Getriebes  
Autor Nachricht
seb



Anmeldungsdatum: 18.06.2008
Beiträge: 6

BeitragVerfasst am: 18 Jun 2008 17:09    Titel: map sensor fault? Antworten mit Zitat

Hi all, sorry its not in german, I have a 1600i beetle and have been having troubles getting it to run correctley. When I first got it, it was very down on power with a very bad miss fire on full throttle and a surging idle.
I have since put these new parts on it,

plugs
rotor and rotor cap
exhaust
Lambda sensor (old one was rusted solid in the old exhaust!)
Ecu relay (had a new one rather than resoldering)

It is now running alot better at full throttle but it has still has a strange fault, at low rpms and at part throttle the engine is very slugish and feels like it wants to return to idle rather than accelerate, I hooked vag-com up and watched the map sensor readout, at idle the reading is 33% but when the throttle is depressed slightly this decreases to 26% if the throttle is then pressed harder the value increases to 40% and then continues to increase with more throttle. Since I can't swap the map sensor as its built into the ecu does anyone know if there is anything else that would cause this I thought maybe the Idle air valve. Also the exhaust sounds very loud, like its blowing but all the joints are good and the sound can be muffled with a rag over the end of the exhaust. I dont have anything to compare it to so I don't know if its normal i'm going to do a compression test at some point to ensure the exhaust valves are seating corectley.

Thanks in advance

Seb


Nach oben
phade



Anmeldungsdatum: 14.09.2007
Beiträge: 235
Wohnort: Kent / Süd-Ost London - (Kent / South East London)

BeitragVerfasst am: 19 Jun 2008 7:37    Titel: Antworten mit Zitat

Hiya Seb,

One quick question, have you checked the vacuum hoses (eg. are they split, chaffed or very old) ? Replacing those with 3.2mm (or 3.5mm if you can get them) synthetic yarn hoses may help. Do not use cheap rubber hoses since they are crap !!

It may also be a good idea to do a fuel delivery and fuel pressure test to make sure that the fuel injection system is working correctly. I have documented this on the 1600i website (see the english part of the website and have a look at the Mechanics and Tips sections for further details).

On the exhaust side of things it seems like that the silencer inside the cat has rotted away (even if the outside of the cat convertor looks ok). Is it still the original cat convertor? If that is the case, then it may be a good idea to get a new one from any of the following:-

- VW Classic Parts Center
- Manfred Graf
- partsvw@hotmail.com (Atonio Trejo)

Good luck with your car.

Regards,

Phil


Nach oben
Doc



Anmeldungsdatum: 08.05.2008
Beiträge: 108
Wohnort: Bibertal/Anhofen

BeitragVerfasst am: 19 Jun 2008 11:36    Titel: Antworten mit Zitat

Hello Sab,
i think the behavior of your map sensor seems to be ok.
Maybe the throttle is not fully closed in idle mode.
The following picture shows a VAG-COM logfile for about 100 secondes at a running engine.
First the engine is in idle mode, RPM about 830, then the throttle was slowly opened until full, about 85°, the RPM limit is reached at 4800.
The blue line shows the load in percent.

Hope this will help you too.

regards
Manfred




_________________
Register Nr. 336
Nach oben
seb



Anmeldungsdatum: 18.06.2008
Beiträge: 6

BeitragVerfasst am: 22 Jun 2008 19:42    Titel: Antworten mit Zitat

Hi guys, thanks for the responses,
The bugs got a new cat on it, the old cat had completely fallen apart (the entire end had blown out) the new one is one from mexico, when I get a chance i'll record the sound it is making.
I've run the engine with vag-com and made this graph, not sure why there is a spike on the load before the throttle opens, I think I bliped the throttle first, I also didn't full throttle it. I'm going to do it all again tomorrow so it looks more like manfreds graph.
While I had the laptop hooked up I pulled the vacume hose for the fuel pressure regulator and blocked the opening on the throttle body. The duration of injection and the lambda readings didn't change at all compared with when the vacume hose was connected, do you think this might indicate a fuel delivery problem?

Seb


Nach oben
phade



Anmeldungsdatum: 14.09.2007
Beiträge: 235
Wohnort: Kent / Süd-Ost London - (Kent / South East London)

BeitragVerfasst am: 24 Jun 2008 16:40    Titel: Antworten mit Zitat

Hiya seb, the only way you will be able to check the fuel pump delivery rate and fuel pressure is to measure them with a fuel injection pressure test set.

I have documented both of these testing methods on the 1600i website in the mechanical and tips sections.

Cheers,

phil


Nach oben
phade



Anmeldungsdatum: 14.09.2007
Beiträge: 235
Wohnort: Kent / Süd-Ost London - (Kent / South East London)

BeitragVerfasst am: 24 Jun 2008 16:41    Titel: Antworten mit Zitat

Hiya seb, the only way you will be able to check the fuel pump delivery rate and fuel pressure is to measure them with a fuel injection pressure test set.

I have documented both of these testing methods on the 1600i website in the mechanical and tips sections.

Cheers,

phil


Nach oben
seb



Anmeldungsdatum: 18.06.2008
Beiträge: 6

BeitragVerfasst am: 28 Jun 2008 13:06    Titel: Antworten mit Zitat

Hi guys,

I got a tire pump today for £2.50 so i'm going to have a go at making a fuel pressure tester.

There is one other symptom it has which is that it pops on deceleration (i.e overrun) it has been suggested to me that it may be the coil only making a weak spark which cant ignite the very lean mixture on overrun or that the ignition timing is wrong, I cant find my timing gun but when I do i'll check that. If the hall sender is failing how would it affect the engine?

cheers

Seb


Nach oben
seb



Anmeldungsdatum: 18.06.2008
Beiträge: 6

BeitragVerfasst am: 14 Jul 2008 16:09    Titel: Antworten mit Zitat

Right, the car has now had a new alternator, found that the old one had a nackered regulator it was wavering between 11 and 16 volts!!!!
Had to take the throttle body off in order to change the alternator and on refitting found that the idle screw was turned in way to far holding the throttle open too much. I have now adjusted as instructed on the website, but my cheapy e-bay vag-com cable seems to have packed up (might have been the 16v that was being pumped into it!!) so I am unable to do a basic settings and clear the overcharging fault code. Have order a new one and it should be here soon.

I do have a question tho, does anyone know what the spark plug gap should be on the plugs, I put some new ones in but couldn't check the gaps as I dont know what it is and don't seen to be able to find it on this site.

cheers

Seb


Nach oben
Timo



Anmeldungsdatum: 20.09.2007
Beiträge: 99
Wohnort: Belgien / Aachen

BeitragVerfasst am: 14 Jul 2008 20:43    Titel: Antworten mit Zitat

Hi Seb,

the gap of the spark plugs should be adjusted to 0.7mm.
If done so, they are worn out at a gap of 0.75mm.

Best regards, Timo



_________________
Register-Eintrag No. 309
Nach oben
Beiträge der letzten Zeit anzeigen:   
Neues Thema eröffnen   Neue Antwort erstellen    Das Forum von www.k-ue.de und www.1600i.de Foren-Übersicht » Technique - Technik Alle Zeiten sind GMT + 1 Stunde
Seite 1 von 1

 
Du kannst keine Beiträge in dieses Forum schreiben.
Du kannst auf Beiträge in diesem Forum nicht antworten.
Du kannst deine Beiträge in diesem Forum nicht bearbeiten.
Du kannst deine Beiträge in diesem Forum nicht löschen.
Du kannst an Umfragen in diesem Forum nicht mitmachen.
Du kannst Dateien in diesem Forum nicht posten
Du kannst Dateien in diesem Forum nicht herunterladen

Ähnliche Beiträge
Thema Autor Forum Antworten Verfasst am
Keine neuen Beiträge Temperature sensor Sanji Technique - Technik 2 24 Okt 2007 5:21 Letzten Beitrag anzeigen
Keine neuen Beiträge ECU communication fault (not my 1600i) phade Technique - Technik 1 03 Apr 2008 17:29 Letzten Beitrag anzeigen
Keine neuen Beiträge Intake mainfold pressure sensor - no ... phade Technique - Technik 1 23 Jul 2008 21:51 Letzten Beitrag anzeigen
Keine neuen Beiträge Zilinderkopftemperatur Sensor Cris Technique - Technik 2 07 Nov 2008 18:12 Letzten Beitrag anzeigen
Keine neuen Beiträge Solved failure: Hall sensor was the b... Pegasín Technique - Technik 0 19 Jan 2009 20:46 Letzten Beitrag anzeigen



(co) 2011 www.1600i.de
Hosted by 1600i.de


phpBB Template by Vjacheslav Trushkin