Alfa 33 16v pinging - Alfa Romeo Bulletin Board & Forums

 
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post #1 of 5 (permalink) Old 03-18-2017, 01:24 PM Thread Starter
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Alfa 33 16v pinging

Hi

my alfa 33 16v (non cat) is making PING noises from the engine. This only happens always that engine is working in effort, for example:

Motorway, 5th gear, about 2000rpm, a sligtly uphill, depress a little the accelerattor pedal, rpm starts encreasing, and when it gets to 2500/3000 rpm it starts pinging.

I use RON 98.

I believe that could be detonation!

There is any way to delay the ignition?

Really need any HELP!

Thanks!

Last edited by m3mber; 03-18-2017 at 01:31 PM.
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post #2 of 5 (permalink) Old 03-19-2017, 02:47 AM
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Hello.
First, I will check if the spark plugs are the correct ones. Best for me are the NGK platinum. Expensive ones but it worth it. And last longer than other. And looking how messy is to change it, better not to do it very often.
If the heat range are not correct, you could have hot spots that makes the mixture ignite before.
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post #3 of 5 (permalink) Old 03-19-2017, 07:43 AM Thread Starter
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Hello

thanks for your reply, the spark plus are the NGK 3500 PFR6B Laser Platinum, I think they are correct.

How can I solve the heat problem ?

Best regards
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post #4 of 5 (permalink) Old 03-19-2017, 08:41 AM
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The plugs are the correct ones, so ther shouldn't be any problem with them.
The heat spots sometimes occurs when the plugs are not the correct heat range.
Make sure that the rotor of the distributor, are perfectly aligned with the mark in the distributor, when the flywheel shows the "T" mark.
If wires, rotor and distributor, and plugs are in order, maybe your problem is a faulty ECU.
Check the resistance of all the wire one by one. I think that the correct value is 5 kilo ohmn per wire.
But in case that some wire were the problem, you should felt a misfire, not a ping.

Last edited by 33Rosso; 03-19-2017 at 08:55 AM.
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post #5 of 5 (permalink) Old 03-19-2017, 09:03 AM Thread Starter
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I believe the problem is not from ECU, I replaced recently the ECU.

When the flywheel shows the "T" mark, the rotor is pointing to the cyl. n1. I'm not sure if its perfectly aligned, but since is point to the n1 cyl the ECU controls the ignition time.

I'm starting to think that the engine has more compression than normal, since the engine was rebuilted.
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