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Hi Pete,
I think one of the purposes of Alfabb is to alert fellow members that traveling down some paths will bear little or no fruit or 'troubleshooting' as per Alfabb's own words below.

'A forum community dedicated to Alfa Romeo owners and enthusiasts. Come join the discussion about performance, parts, modifications, troubleshooting, maintenance, and more!

I had noticed Kamhas had received no advise as I understand it to assist him in the last 2 months with regards to ECUs. My comments presented may seem on the face of it as 'nit pick' as you said Pete, but they are friendly criticisms, amicably discussed with a suggested alternative to help Kamhas with his project, i.e. troubleshooting. With out my comments Kamhas may have taken longer to get to the 'eureka moment'. Kamhas' self criticism of his approach will hopefully give him the outcome he wants.

Regards Steve
 

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Discussion Starter · #145 ·
@Steve105 @PSk steve and pete....finally in between surgeries got Ikram the mech over....disconnected the fuel rail and checked the injectors...three firing very little inspite of adequate signal form the ECU and one overspraying. Its the injectors.....probably dried out. Going for repair to the injector lab..if they dont work will get new ones or ones with similar rating. Any suggestions from Japanese cars??? Getting somewhere finally
 

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I spoke with Jiri about your ECU and injector issues and he said happy to help, but needs to know year of engine/car it came from and details of ECU. He can also repair and do upgrade/performance chips for ECUs.
S
 

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Discussion Starter · #147 ·
Thanks. I will certainly contact him. The injectors have gone off for refurbishment locally. As soon as these are back..max midweek I will see. I think will send of the ecu to him for checking and repairs
 

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Discussion Starter · #148 ·
Injectors came back, Installed. Car started firing on all cylinders. Smoky exhaust as the oil in the exhaust was being blown off. Smooth otherwise. Could not drive it as the Celica battery was dead and it was parked in front. Battery charged now. More news in the morning
 

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Discussion Starter · #149 ·
Some fun and games over the last few days. In my previous post the car fired up after the injectors returned and then I took it out after a few days. Started spluttering again and got home after a several mile drive with difficulty , misfiring and basically no go. Anyhow stripped the fule rail and checked, the injectors were clogged with rust form the fuel tank.... guess what we had forgotten the fuel filter.......Ha Ha. Unclogged the injectors and it fired up right away.... the engine is smooth and pulls well . Drove it for 60 miles today.. as a shakedown on our version of the London M25 ...our Ring Road which is a 3 lane motorway lightly trafficked at the moment. Detected two issues...the driveshaft hasnt been balanced fully so there is a vibration above 55 mph and the exhaust appears to have been rigidly hung as well... and not with the supplied kit so there is a resonance..... but these are just minor issues. The main one ...SORTED. Plus gone more mad... converting my C180 w204 to a C63 AMG. Before internal combustion combusts better to try a pinnacle engine....... next new modern car is going to be electric. Converted home yesterday to Solar Power feeding power to the grid as well and taking it back in the eif required.
 

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Discussion Starter · #150 ·
Progress .The engine is done. Slightly smoky ....rich mixture...not blue smoke...on start up but its not run in 15 years probably so bedding in. There is another issue that troubles now and that is a vibration ...its not the engine per se. The car has a severe boom/ vibration/ resonance when passing through 3000 to 3500 rpm...

There is an Alfaholics stainless exhaust fitted using the supplied brackets. The boom / vibration starts on acceleration and worsens on deceleration back from lets say 4000 rpm. It does this in neutral as well as in gear.. all gears but seems especially worse in 4th and top. Clutch in clutch out and in neutral. Interestingly I had the courage to go past all the noise and yes vibration and in top at 5000 rpm the car became super smooth and almost modern. Ran out of road due to traffic as was going at 85 mph indicated.

Had the drive shaft balanced three times...so its probably not that...any advice appreciated...do I need to get a flexi joint into the exhaust.

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Your post 3 months ago
'The car is fine at idle but splutters on acceleration .. misfiring its way to 70 mph..which is where I took it. appears to be the AFM...which was obtained form Malaysia. I haven't done any surgery on it as it still works after a fashion. It did take the car to 70 plus mph when I stopped as
3. driveshaft vibration set in at 70 plus...a consequence of the handbrake lever anchoring bolt hitting it and possible unbalancing it. '

Sounds you have not made any real progress. I think you need to start again as your engine may be stuffed, may be a bent crank or poorly assembled engine. fly wheel not put in the correct spot, and or not balanced with crank and crank pulley or fuel rail is still contaminated with rusty particles so fuel delivery is intermittent. Then again it could be the ECU as before, that is the injectors may work, but point of the ECU is fuel delivery at the appropriate time. Don't forget 'the crank angle sensor' as it may also be stuffed.
Good luck Steve
 

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The car has a severe boom/ vibration/ resonance when passing through 3000 to 3500 rpm...
Is it just noise or also a physical vibration? I have the same issue (just noise) with a stock exhaust on my Giulia and it’s driving me insane.

I’ve added dynamat, rebuilt the diff, had the drive shaft balanced and changed the front exhaust muffler to no avail. After winter I’m going to put a new back box on I have in the garage to see if that has any effect.

So if you find a solution, please do let me know;)
 

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I had a similar problem that took a while to track down. The resonance was in the exhaust system - I used a strobe light to confirm it but modifications to the exhaust system made no difference. In my case the splines on the clutch plate were worn which enabled it to run off center and create vibration which was amplified when the rpm corresponded to the natural frequency of the exhaust system.
 

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Discussion Starter · #155 ·
Your post 3 months ago
'The car is fine at idle but splutters on acceleration .. misfiring its way to 70 mph..which is where I took it. appears to be the AFM...which was obtained form Malaysia. I haven't done any surgery on it as it still works after a fashion. It did take the car to 70 plus mph when I stopped as
3. driveshaft vibration set in at 70 plus...a consequence of the handbrake lever anchoring bolt hitting it and possible unbalancing it. '

Sounds you have not made any real progress. I think you need to start again as your engine may be stuffed, may be a bent crank or poorly assembled engine. fly wheel not put in the correct spot, and or not balanced with crank and crank pulley or fuel rail is still contaminated with rusty particles so fuel delivery is intermittent. Then again it could be the ECU as before, that is the injectors may work, but point of the ECU is fuel delivery at the appropriate time. Don't forget 'the crank angle sensor' as it may also be stuffed.
Good luck Steve
The engine is generally smooth ....no missing whatsoever. However its got a new clutch and pressure plate and the flywheel was also balanced. The crank appears to be fine. In my experience if there is an issue with the engine....flywheel clutch its felt through the pedal which is silky at all revs....tried it. The problem appears to be in the exhaust... will work it out.
 

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Discussion Starter · #156 ·
I had a similar problem that took a while to track down. The resonance was in the exhaust system - I used a strobe light to confirm it but modifications to the exhaust system made no difference. In my case the splines on the clutch plate were worn which enabled it to run off center and create vibration which was amplified when the rpm corresponded to the natural frequency of the exhaust system.
yes its an exhaust resonance....although the clutch is fine I think I will get its alignment and of the driveshaft checked. There was some improvement after the splines of the driveshaft were lubricated...there is some play there....that might be the issue as the driveshaft balancing as been off the car. However that would still not explain the issue with the clutch disengaged...

Having done so much will get to the bottom of this as well.
 

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You are supposed to balance the crank, flywheel and crank front pulley as an assembled unit. doing it individually can lead to vibrations.
These guys explain the process in more detail.
Regards Steve
 

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Discussion Starter · #158 ·
You are supposed to balance the crank, flywheel and crank front pulley as an assembled unit. doing it individually can lead to vibrations.
These guys explain the process in more detail.
Regards Steve
Sure...for race engines @Steve105...needs specialised equipment which isn't available in Pakistan unless I approach the Pakistan Air Force Dassault Mirage rebuild factory ( we have rebuilt about 150 Mirage III and V fighters and fighter bombers). but how many times has one put in a new clutch plate and pressure plate along with a flywheel and balanced the crank and the pulley with it. Not ever I think. The only time I had the driveshaft and the clutch pressure plate balanced off the car was in my GTV6 which has a transaxle so the driveshaft and the clutch/flywheel/ assembly can be taken off and balanced. But disassembling the engine...taking off the crank and pulleys and getting them on a balancing machine provided one can be found.....might as well give up now. I suppose I could dismantle the engine..take the crank off and send it off to Australia but for customs who dont allow such things..export needs a special permit which would take me several months of trips to customs and then reimport which would entail the same thing...LOLZ
 

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Hi Kumhas,
I looked up some of the background and history of the difficulty of putting together old cars in Pakistan, to try and understand what it's all about and the limits you face.
It looks like Pakistan does not have an auto manufacturing industry at the moment as it was abandoned/shut down due to political pressure for what ever reason/s and it relies on taxing imported new cars to generate revenue.
When car parts come into the country as scrap metal they are examined closely as the Govt does not want recreated old cars so they impose permits and/fines and other severe penalties as you said. I think so they don't miss out on sale tax revenue.
This makes things very difficult for enthusiast like your self who don't have access to some restoration services.
Please accept my apology.
Here is a news item that gives the background of car enthusiasts struggle in Pakistan.
Regards Steve
 

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You are supposed to balance the crank, flywheel and crank front pulley as an assembled unit. doing it individually can lead to vibrations.
These guys explain the process in more detail.
Regards Steve
Steve, you misunderstood that article which refers to a particular type V8 engine with counterweighted flywheel & front pulley.
While it IS necessary for this type of engine to have those items fitted while balancing, it is NOT necessary for an engine like our 4 cyl Alfas where the flywheel & pulley are plane, uniform-mass units to have them on the crank for balancing. So long as all the crank diameters all run true to main bearings, firstly the crank is zero balanced & then it becomes a 'mandrel shaft' for balancing the flywheel & pulley as well. OR if you are replacing a flywheel/clutch or pulley you can use a plain mandrel shaft made to mount those parts, as the substitute for the crank for the balancing process.
Provided all your diameters run true, any of the individual parts can be zero balanced & added or exchanged from an engine assembly. So the flywheel should be zero balanced, then the pressure plate added (& marked for position) then it too can be zero balanced. this is the normal procedure for component replacement off the engine.
regards,
Vince
 
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