Spark Plugs

[rishik]

i have a 1991 Saab 900i 16V 2.0, i noticed some shuddering from her when driving on the motorway last night when deaccelerating between 70 and 50. she is due a service and i thought i'd start by changing the spark plugs but am getting conflicting info from websites and garages:

do i need "bcp5evx" plugs or "bcp6es" plugs - i know the main difference is resistance plus the 5evx is over 4 times the price of 6es!! can someone please tell me if i can or can't buy the cheaper 6es - will it affect perforamce or maybe i should look at a completely different plug all together, maybe the 5es?

i know i need a 10mm socket will something like this do to change them?
http://cgi.ebay.co.uk/Toolmaster-10-...1%7C240%3A1318

many thanks in advance

[EvanD]

I have BCP7ES in mine for a turbo car...So i believe you need BCP6ES

[grif900]

You can go with the less expensive plugs, the evx iirc is "iridium" and they work just as well only longer. Saab cars thrive on NGK plugs and I don't know why.

[rishik]

cheers for your help guys; i think i'm going to go with the bcp6es then, if no one else can see a problem with that.

p.s. grif900 that picture of your saab looks awesome!

[rishik]

i put the bcp6es in today, however the plugs i removed where bcp5es - is this going to be ok!?

[grif900]

New N.G.K. plugs that are the right spec are good. If you bought them for short money and are not saab specific, you might need to gap them. iirc BCP5EV or ES were never recomended for 16v engines.

[Rodentmaster]

..........must be a market or climate aspect....

BCP5ES are what's specified for the 2.1l in this southern waste land.

[grif900]

So, how does the car run now?

[Shan]

Here is a scan of the 1992 Saab 900 owners manual, specifying the type of spark plugs required :

[rishik]

thanks for that shan i took out the bcp6es i put in yesterday as she stalled twice on a 10 mile journey and just didn't feel right. i replaced them with a set of bcp5evx and touch wood no problems, she is roaring like the beast she is!

also grif cheers for the heads up on the heater valve, it was late yesterday, had just resitted my instrument panel to find the thermostat no longer worked. on trying to reconnect end up with the whole linkage loose in my hand, managed for fix in mins after removing the left speaker/vent cover.

does anyone know why when i rev hard i get a few drips spirting out of the exhaust?