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Discussion Starter · #1 ·
Ok, so i entrusted a friend to service my CSE 2.3t LPT while i was away did a good job but the car has had a mild misfire ever since. Changed the DI cart earlier today and no difference at all. plugs new when serviced, so thought i would check the gap. And what do i find????? Champion EON 1 fitted, certainly not the NGK I specified........could this be the cause of a mis-fire?????? not so much under load but raising the revs when stationary and on the over-run and low throttle????

Alun
 

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Alun

A little while ago I posted information regarding spark plugs and why NGK should be used with Saab DI.

Do a search for NGK and my member number and you should find it - unless someone can find it for you first.
 

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99% sure to be the cause of the problem! That's the good news.

The bad news is that I understand that non resistive plugs are not good for the longevity of the DI cassette


The DI system is very sensitive to plug types and gapping; amongst other things IIRC it measures ionisation resistance across the plug during burn as part of the overall engine management function. Stever cluff!

[edit]

The only alternatives I know of are the NGK platinum series (BCPR7EVX-11) but you'll pay a price for them. How much better they are I don't know, but they do offer longer life.

NGK VX Platinum
 

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Here's the info again:

ONLY USE NGK PLUGS!

Hope this info helps:

Guide for Direct Ignition cassette and spark plug service - all DI-equipped vehicles

Using non-resistor spark plugs could cause several different types of fault symptoms and driveability problems in the car. The DI uses the spark plugs are used to monitor the combustion process.

An incorrect spark plug gap (excessive wear) can also lead to driveability problems. Use of non-resistor spark plugs could also destroy the DI cassette.

! - Spark plug burn-off - !
Automatic spark plug burn-off is carried out with a burst of sparks each time the engine is switched off. Burn-off is carried out in all cylinders simultaneously and lasts for 5 seconds at a rate of 210 sparks per second.

! -This Is Lethal Current Use Extreme Caution- !

Therefore, it is very important to adhere to the following guidelines :

When replacing the spark plugs it's important to check following:

- First Allow 30 seconds for the module to power down then remove the electrical plug to ensure your safety.
- Always use resistor type NGK spark plugs. All Saabs equipped with DI cassettes have been specified with resistor type NGK plugs
- Verify the correct gap at the electrode (1.0mm -1.1mm)
- Check For oil leakage from coil assemblies. This would indicate a failed DI assembly.

Before installation of the DI cassette:

Coat the rubber boots on the cassette with Krytox (P/N 30 19 312) or a name brand dielectric grease.
Check to be sure that the contact springs can be seen inside the coil towers and replace them if they are damaged or missing ( P/N 91 67 032)
Coat the thread of the spark plugs with Molycote 1000 (P/N 30 20 271) or high temperature anti-sieze.

Torque:

Install and torque the Spark plugs to 21 lbf ft
Fit the Cassette to the valve cover and torque to 8.1 lbf ft

Spark plug considerations

"7" series spark plugs have a colder heat range than "6" series and are, therefore, commonly used as an alternative plug on cars consistently run at high speeds or under heavy loads.

"R" in the NGK plug designation signifies resistor type.
 

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Discussion Starter · #8 ·
Do I take it then that NGK BCPR7ES should be used ????????????

the Champions are out.the NGK's are in.......

I consider myself suitably chastised for even mentioning anything other than NGK........

seriously, thanks all for the help

Alun
 
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