205 1.9 Gti engine problem
Discussion
Hi...
Please can anyone shed any light on why the breather pipe between the inlet manifold and the air flow meter has been blocked off on my Pug?
The air flow meter might be a little tired ( Ok, broken perhaps.) The mixture is definitely too rich (smells lovely!) When I try and adjust the mixture down, nothing much seems to happen.(Although it does seem to adjust up.!).The engine idles at between 1500 and 2000 rpm once it is warm. And if I adjust that down it tends to stall a lot when the engine is cold.
I know that blocking the pipe was a bodge job for something but what problem is it a bodge for...? Surely if it was just the air flow meter that was the problem, then it should have just been replaced. ( During big rebuild project last year.) Any insight would be appreciated...
Please can anyone shed any light on why the breather pipe between the inlet manifold and the air flow meter has been blocked off on my Pug?
The air flow meter might be a little tired ( Ok, broken perhaps.) The mixture is definitely too rich (smells lovely!) When I try and adjust the mixture down, nothing much seems to happen.(Although it does seem to adjust up.!).The engine idles at between 1500 and 2000 rpm once it is warm. And if I adjust that down it tends to stall a lot when the engine is cold.
I know that blocking the pipe was a bodge job for something but what problem is it a bodge for...? Surely if it was just the air flow meter that was the problem, then it should have just been replaced. ( During big rebuild project last year.) Any insight would be appreciated...
It has been known for people to block off the SAD unit due to it malfunctioning, this is only used for cold starting.
I would make sure both ends are blocked properly if this is the case. I have seen the manifold end (below the plenum chamber) break and cause rough running as it sucks in extra air past the AFM and throttle butterfly.
Worth checking your throttle position switch if you are suffering idle problems, you should just hear the click when you gently open the throttle off its stop.
Check to see if someone has opened the top off the AFM, telltale signs are some new silicone to stick it back on. If so remove it again and check to see if its been tampered with, normally people will mark the spring tensioner before making adjustments but some dont, if its marked return it back, if not find another AFM and see if the car runs better.
I would make sure both ends are blocked properly if this is the case. I have seen the manifold end (below the plenum chamber) break and cause rough running as it sucks in extra air past the AFM and throttle butterfly.
Worth checking your throttle position switch if you are suffering idle problems, you should just hear the click when you gently open the throttle off its stop.
Check to see if someone has opened the top off the AFM, telltale signs are some new silicone to stick it back on. If so remove it again and check to see if its been tampered with, normally people will mark the spring tensioner before making adjustments but some dont, if its marked return it back, if not find another AFM and see if the car runs better.
supplementary air device explained: www.205gtidrivers.com/articles/e3-sad.html
Rob_the_Sparky said:
Trouble is that if someone blocks of the SAD (what a bodge!) then you either will have no idle when cold or very high idle when hot...
A lot of people in rallying totaly remove it from the system as its not really needed, nothing a little kick on the throttle can sort out to keep it going when cold
With regards to idle adjustment, the number of people i have seen trying to alter the throttle stop instead of the air bypass screw is shocking! under no circumstances should the stop be adjusted unless there is a problem with it and the position switch it also affects.
Woah.! Wow. Amazing amount of response, thanks so much everyone..! I'd better get reading up on all this then. Bit more complicated than I'd hoped...! I certainly don't know enough to fix this over night.
Rob the Sparky, nails,heads and hitting comes to mind..!
Mikey G, regarding the idle adjustment, I'm guessing I got the right thing (otherwise the mechanic who showed me would prove to be a real 'spanner') I'm sorry to say that the bit you wrote about AFM went just a tad over my head (I confess that I am but a girl of little mechanical comprehension) But thanks for the tips which I WILL get to grips with, given time!
Rob the Sparky, nails,heads and hitting comes to mind..!
Mikey G, regarding the idle adjustment, I'm guessing I got the right thing (otherwise the mechanic who showed me would prove to be a real 'spanner') I'm sorry to say that the bit you wrote about AFM went just a tad over my head (I confess that I am but a girl of little mechanical comprehension) But thanks for the tips which I WILL get to grips with, given time!
Morty said:
Sorrento205, I just checked out that webpage you mentioned...! VERY useful! Thanks! ( Does anyone else find Haynes a bit misleading at times..??)
The Haynes (book of lies) is quite bad. The earlier edition for the 205 is best
Join the forum it will help with everything.
I often inherit symptoms I read about on there!
Edited by simes205 on Tuesday 12th September 21:48
Mikey G said:
It has been known for people to block off the SAD unit due to it malfunctioning, this is only used for cold starting.
I would make sure both ends are blocked properly if this is the case. I have seen the manifold end (below the plenum chamber) break and cause rough running as it sucks in extra air past the AFM and throttle butterfly.
Worth checking your throttle position switch if you are suffering idle problems, you should just hear the click when you gently open the throttle off its stop.
Check to see if someone has opened the top off the AFM, telltale signs are some new silicone to stick it back on. If so remove it again and check to see if its been tampered with, normally people will mark the spring tensioner before making adjustments but some dont, if its marked return it back, if not find another AFM and see if the car runs better.
I would make sure both ends are blocked properly if this is the case. I have seen the manifold end (below the plenum chamber) break and cause rough running as it sucks in extra air past the AFM and throttle butterfly.
Worth checking your throttle position switch if you are suffering idle problems, you should just hear the click when you gently open the throttle off its stop.
Check to see if someone has opened the top off the AFM, telltale signs are some new silicone to stick it back on. If so remove it again and check to see if its been tampered with, normally people will mark the spring tensioner before making adjustments but some dont, if its marked return it back, if not find another AFM and see if the car runs better.
Do you think that replacing the AFM would help, or is it more a matter of adjusting bits and pieces to get it running more smoothly...? There's no sign of tampering as such, the whole engine was rebuilt last year, I didn't really even look under the bonnet before that was done.. Although I did ask for as many of the original parts to remain (if they were sound) when it all went back in.. I do know that the electrics are in a bit of a state, I'm putting in a new wiring loom in a week or two..
http://forum.205gtidrivers.com/
im not totally ofay with the forum procedure, but i believe you have to go into this section http://forum.205gtidrivers.com/index. teh new users startup and make a post stating you promise to abide by the rules etc etc
apart from that the forum is really good and i'd recommend it to anyone with a 205/309/405 for all the help and advice available there
im not totally ofay with the forum procedure, but i believe you have to go into this section http://forum.205gtidrivers.com/index. teh new users startup and make a post stating you promise to abide by the rules etc etc
apart from that the forum is really good and i'd recommend it to anyone with a 205/309/405 for all the help and advice available there
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