Fuel injectors
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
89 Vettes have the 22lb. Multec fuel injectors which are not compatible with todays blended fuels.
The coil insulation will eventually deteriorate from the fuel causing a short in the injectors leading to reduced engine performance, which is why many members replace with the modified Bosch III's Jon Banner (FIC) sells.
The coil insulation will eventually deteriorate from the fuel causing a short in the injectors leading to reduced engine performance, which is why many members replace with the modified Bosch III's Jon Banner (FIC) sells.
Le Mans Master
Joined: Oct 2004
Posts: 6,314
Likes: 508
From: South-central Missouri
But, do the test after they're HOT, not cold; very important. (but if they're original, pre 93s, AND you have ethanol, like the man said, they won't handle it. Replace one, replace 'em all, if stock.
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Safety Car
Joined: Jan 2004
Posts: 3,759
Likes: 8
I put Bosch III 22# in mine and the BLM's were showing a super lean condition all the time. Ended up putting in the 24# injectors, and the BLM's were in the safe range. Ended up dropping the injector constant in the tune down to around 21.5 to lower the overall BLM's a little bit to keep it running closer to the rich side of the range.
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
I have a set of the Bosch III's specifically made for my 91 by Jon Banner, which I tested out for him.
I don't know the BLM count but, my 91 Vette passed California's Emissions test Very Cleanly!...
I don't know the BLM count but, my 91 Vette passed California's Emissions test Very Cleanly!...
Pro
Joined: Jul 2010
Posts: 600
Likes: 56
From: Elyria, Ohio
Thanks, GKK.....I knew I read something about it but couldn't remember what. So what do you do when the injectors start to go bad.....just replace them? I hope I'm not hijacking the thread....this is a related question.
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
When the Multecs go bad, replace with the Bosch III's and you're good to go!...Also, Multecs can not be cleaned or serviced.