idling problem

[alfaholic 001 0]

ok guys so I just started and drove my 2l selespeed tonight after doing the cylinder head and I have a problem, the idling would just climb by itself to about 2000rpm in any gear, if I just tap the accelerator then it drops back down to normal for a short while

 

Also when I drive, its not all that smooth like before and once agen when I come to a stop, the revs will just climb to 2000rpm and drop on its own after about 3seconds

 

Any ideas????

[Smaky 73]

Ceck the duct betwen the MAF and throttle body for splits, also ensure the clamps are tight at each end and the 4 torx for the TB are tight, check the 4 inlet tubes are tight to and that all plugs are properly connected, make sure the breather hoses are connected right and dont forget the brake vaumn line, then go for the much fabled throttle body reset, this may itself cure the problem, if it persists then clean the throttle body and check the plugs are torqued correctly, then if that hasn't solved it you need to start lookingat all the things you've been playing with through the work you've done.

[alfaholic 001 0]

Thanks, will give it a shot later after work and let you know

[alfaholic 001 0]

Iv only had a chance to do the throttle body reset and unfortunately it has not sorted the problem, what I have also noticed is that when I come to a stop and the revs climb, the battery light flickers

[Smaky 73]

Check the charge wire is tight on the positive terminal block and that that itself is tight onto the battery.

[alfaholic 001 0]

Its tight, have not seen the battery light since, all pipes are fine and tight, throttle body reset, problem still exists, could it be the MAF? Also the air filter is a little blocked, could it cause the problem?

 

Oh yes and its running very very rich

[Smaky 73]

Its tight, have not seen the battery light since, all pipes are fine and tight, throttle body reset, problem still exists, could it be the MAF? Also the air filter is a little blocked, could it cause the problem?

 

Oh yes and its running very very rich

 

What temperature is it running at?

[alfaholic 001 0]

On idle it goes to 90

Wen driving it goes to aroun 70

 

I forgot to mention that it backfired very very loud on the first start up

[alfaholic 001 0]

I cleaned throttle body, checked all piping and wiring no visible faults, reset throttle again, problem is still there, in neutral if I rev up 3000rpm then it stays there for about 2 seconds, then slowly drops to 950rpm

[Smaky 73]

I cleaned throttle body, checked all piping and wiring no visible faults, reset throttle again, problem is still there, in neutral if I rev up 3000rpm then it stays there for about 2 seconds, then slowly drops to 950rpm

 

 

Well you have 2 or more problems here then,

 

First the temperature fluctuations, that's a thermostat change which is required.

 

Secondly I think you may have a dodgy ICV on the throttle body if you have the cable operated one, if it's drive-by-wire then the TB itself is at fault.

[alfaholic 001 0]

Another guy told me that the big backfire could have cracked the intake manifold, is this possible?

[Smaky 73]

Another guy told me that the big backfire could have cracked the intake manifold, is this possible?

 

Yes, as well as damage the throttle body and MAF.

[alfaholic 001 0]

I have another intake manifold but there are some metal filings inside it, I managed to get most of it out will a little bit of filings be a problem

[alfaholic 001 0]

Iv changed the intake manifold, car drives much better but it now idles too low and cuts out when I come to a stop

[Smaky 73]

I have another intake manifold but there are some metal filings inside it, I managed to get most of it out will a little bit of filings be a problem

 

Yes they will.

[alfaholic 001 0]

I've managed to get the filings out, car drives much better but it now idles too low and cuts out when I come to a stop

[alfaholic 001 0]

Iv got a fault code

P0725 - Engine speed

That will b the sensor at the back by the crankshaft and has the brown plug??

[Smaky 73]

Yes. But check the earths for the engine and ECU for continuity first as if the engine isn't cutting out on you then it's more likely a minor wiring issue.

[alfaholic 001 0]

Uhm, I checked the wiring, everything seems fine, earths are clean and tight

I changed the engine speed sensor, cleared fault code. Still same problem and fault code reappears immediately after engine cuts out. It says P0725 engine speed

[Smaky 73]

Uhm, I checked the wiring, everything seems fine, earths are clean and tight

I changed the engine speed sensor, cleared fault code. Still same problem and fault code reappears immediately after engine cuts out. It says P0725 engine speed

 

I would think i is definately a wiring issue now, have you checked the pins in the ECU from the engine loom plug?

[alfaholic 001 0]

Yup, I checked them, 1 was a little bent but I'm sure it still made contact, any ways I bent it back successfully. What would be my next step?

[Smaky 73]

Yup, I checked them, 1 was a little bent but I'm sure it still made contact, any ways I bent it back successfully. What would be my next step?

 

Remove that plug again and ensure it's still straight, if you like take a pic and upload it and I'll see which pin it was and what it's used for in the loom.

[alfaholic 001 0]

Checked it again about an hour ago, it was still straight, its one of the big plugs on top of the throttle body, I will take a pic tomorrow and upload

[alfaholic 001 0]

I think i found the problem, there is a leak on the intake manifold

[Smaky 73]