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BigAl |
Posted: Fri May 08, 2009 1:15 pm Post subject: |
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Jeremy, you could disconnect the lambda sensor to rule it out, if you have one connected.
Mine runs smoother when not connected, i am lucky though as i can just swap the fuel selecting dongle, i have no idea where they are on later cars, maybe by the ECU? |
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john 33_16v |
Posted: Fri May 08, 2009 9:11 am Post subject: |
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JeremyC wrote: |
No fuel dongle so the state of my lambda sensor is irrelevant so where is my flat spot (2.3 ish to 3) coming from? |
Hi,
My 93 car has no fuel dongle or the plug either like on Big Al's car- we had a look at SAD. However the lambda is definitely NOT irrelevant, and could cause a flatspot.
I'd avoid opening the AFM if poss- nothing will fly out though. You can put electrical conductivety fluid on the tracks which may help. I remember people talking in the past about truly faulty AFMs and they tended to make the car run really badly with massive stammeres tot he point of being undriveable.
I have started my car before with the AFM accidentaly disconnected and it wouldn't idle properly and was sort of breathless.
Cheers,
John |
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JeremyC |
Posted: Fri May 08, 2009 8:41 am Post subject: |
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That's presumably the square cover between air filter and penum yes?
Any upleasant suprises when I take the cover off? Springs and cogs flying everywhere. |
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BigAl |
Posted: Thu May 07, 2009 6:00 pm Post subject: |
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It could be from you AFM tracks, they can get worn out where they sit most often. Do you have access to another AFM to rule out yours, or you can take off the cover and have a look. |
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JeremyC |
Posted: Thu May 07, 2009 5:18 pm Post subject: |
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No the factors was closed so I tested my existing one, which if your experience is anything to go by is spot on.
No fuel dongle so the state of my lambda sensor is irrelevant so where is my flat spot (2.3 ish to 3) coming from? |
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BigAl |
Posted: Sat May 02, 2009 7:48 pm Post subject: |
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I believe that the idle temp should be 90 degrees. I think alfa made the dials read 80 when it should read 90. I had mine on scantools and it showed engine temp of 90 and the temp gauge showed 80, go figure.
Did you replace yours or test / compair your old one first |
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JeremyC |
Posted: Sat May 02, 2009 6:43 pm Post subject: |
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And the results from the Hampshire jury :
80 - 250
70 - 340
55 - 520
40 - 885
All temperatures from the dash which shows bang on 80 once warmed up, going up to just over when stationary and as the 'stats open at 86 and my car has a new 'stat I'd guess the dash temperature gauge is about right.
Comparing these with Al's figures it would seem that the ECU will be thinking the engine is 10 degrees hotter than it actually is, so, the question is, what will that cause it to do? |
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lee16v |
Posted: Thu Apr 30, 2009 10:26 pm Post subject: |
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JeremyC wrote: |
Is it a plenum off job or is it on the outside? |
It's on the inside of the throttle body and it would be easier with the plenum off. Having said that, I did mine with the plenum on and didn't have to much of a problem. |
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BigAl |
Posted: Thu Apr 30, 2009 3:29 pm Post subject: |
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If you got it, spend it
Hope this helps
Here is the end of the CTS extension lead that joins onto the loom, its near the injectors.
You can test the output without removing the sensor when engine is cold and when running and hot.
Here is the location of the CTS, i have removed one air bypass tube to the throttle body for a clearer view. I think its a 19mm and you can see that the extension lead touches on the coolent pipe. If you can get that off the CTS should come off without damaging the pipe. You shouldnt have to remove the plenium chamber to do this.
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JeremyC |
Posted: Thu Apr 30, 2009 2:49 pm Post subject: |
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At the risk of appearing to have too much cash, at less than £15 quid I'd rather just whack a known good one (as 'known' as any new part can be anyway) and have done with it.
Measuring static with the engine off is one thing, a hot engine bay with coolant rushing past it and the vibration of driving is something else althogether. |
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BigAl |
Posted: Thu Apr 30, 2009 2:44 pm Post subject: |
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hey JeremyC
have you checked the reading from yours? I wish i did before I spent £20 on a new unwanted unused one.
http://www.alfa-pages.co.uk/viewtopic.php?t=5744&highlight=cts
Multimeter set to 20 kOhm, should get
-10C = 9 kOhm
0C = 6 kOhm
+10C = 3.8 kOhm
+15C = 3 kOhm
+20C = 2.5 kOhm
+25C = 2.1 kOhm
+30C = 1.7 kOhm
+40C = 1.2 KOhm
+60C = 600 Ohm
+80C = 330 Ohm |
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JeremyC |
Posted: Thu Apr 30, 2009 2:40 pm Post subject: |
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Cheers.
Stock item at my local factors, about £11 plus Darling's cut.
Is it a plenum off job or is it on the outside? |
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lee16v |
Posted: Thu Apr 30, 2009 10:46 am Post subject: |
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I think we've got our wires crossed.......when I say spare I meant a replacement that was sitting in another throttle body I had not a brand new spare! Sorry for confusion.
Anyhow, I've been out and had a look at the one I took off and it is a Bosch with the number 0 280 130 026 stamped on it.
Hope that's of some use. |
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JeremyC |
Posted: Thu Apr 30, 2009 10:34 am Post subject: |
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Do you still have the packaging, any sort of part number? Bosch or QH.
Sorry to be a pain (may even pick one up at Brooklands!).
Thanks again. |
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lee16v |
Posted: Thu Apr 30, 2009 10:31 am Post subject: |
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I dont know how much Jeremy as mine was a spare. I'd of thought it was a main stealer part but a quick call to your local factors can't hurt. There was one on ebay last week (i've checked and it has gone....doh!) and that was up for 25 quid so that might be a reference.
Cheers. |
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JeremyC |
Posted: Thu Apr 30, 2009 8:51 am Post subject: |
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Thanks.
Hmmm, think that might be my next target though the car is definitely running better with the new 'stat.
Are they generally available from motor factors? How much was it?
Cheers |
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lee16v |
Posted: Wed Apr 29, 2009 10:25 pm Post subject: |
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Yes Jeremy, the one in the passenger side throttle body. |
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JeremyC |
Posted: Wed Apr 29, 2009 2:31 pm Post subject: |
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Lee, that's the CTS in one of the throttle bodies yes? |
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lee16v |
Posted: Wed Apr 29, 2009 12:18 pm Post subject: |
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Always nice to have a good running motor Al. |
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BigAl |
Posted: Wed Apr 29, 2009 1:20 am Post subject: |
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no hesitation from standstill, wahoo, changes are, different ecu and running with lambda correction and new lambda sensor. |
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BigAl |
Posted: Tue Apr 28, 2009 12:39 pm Post subject: |
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Hey lee, well done mate.
No not yet, my mate hasn’t been working nights of late so no access to the emission tester. There is definite corrosion on the cable from the CTS to the loom, I should try some contact cleaner. When the car was on the scantools diagnostics, it was registering 90c so I guess it was working. The CTS is still reading correct, 300Ohms at running temp.
I have been letting the car warm up for 2 minutes of late, but will try setting off straight away today. I have noticed that since i have changed the ECU and lambda sensor that the car now gets to idle speed in 5 seconds, whereas before it used to take up to 3 mins. |
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lee16v |
Posted: Tue Apr 28, 2009 12:16 pm Post subject: |
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Al,
Did you get to the bottom of it?
Just to let you know, I changed my CTS with a spare when I did the water pump and all is well in the world again (but for how long ) Well, It was only 6 years in diagnosing |
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BigAl |
Posted: Wed Apr 08, 2009 8:56 pm Post subject: |
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He lee, i think you might be onto something, i went to double check my CTS and noticed that the engine note changed when i moved the cable, i think i might have a dodgy connection, i will only be able to tell when i get it on the emission tester. |
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BigAl |
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lee16v |
Posted: Tue Apr 07, 2009 2:43 pm Post subject: |
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Al, been thinking about this and the only thing I've never replaced is the coolant temp sensors. Do you think these may be playing up causing the ECU to think the engine is warm when cold thus not giving the engine the 'choke' fuel mix?
I've got two spare sensors. I might pop them in when I do the water pump and see if they have any effect. |
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