q45 1991 upgrade injectors

[srpim]

Will fuel rails and injectors for newer Q45 fit a 1991? Would the matching harness fit, or would it have to be spliced? Has anyone tried the Deatsch injectors and adaptors?

I am doing the "replace everything under the plenum" job. Two injectors were bad and the engine was running rough. I have read many posts about the trouble people have had with the older injectors. This car has always lived with MTBE and/or ethanol in the gasoline, 110,000 miles.

I do not want replace just two and then need to to pull the plenum again, so it seems like the options are: replace all with Original Equipmentreplace all with Deatsch (newer style with adaptors)replace all and rails with pulls from a newer style Q45?replace rails and use newer year OEM injectors?

Spending some money now is worth it to avoid trouble later.

I have not seen this really answered in previous posts.

[Fridge]

I did the modification last year and it was not that big of a deal . That being said I now have a dead injector it is not reading high ohms though must be another problem. I would suggest using new injectors instead of the rebuilt ones. I dont think the fuel affects the newer )94) injectors there probably some other problem with mine.By the way my Q is for sale in the classifieds.

[Haitian_King]

Will fuel rails and injectors for newer Q45 fit a 1991? Would the matching harness fit, or would it have to be spliced? Has anyone tried the Deatsch injectors and adaptors?

I am doing the "replace everything under the plenum" job. Two injectors were bad and the engine was running rough. I have read many posts about the trouble people have had with the older injectors. This car has always lived with MTBE and/or ethanol in the gasoline, 110,000 miles.

I do not want replace just two and then need to to pull the plenum again, so it seems like the options are: replace all with Original Equipmentreplace all with Deatsch (newer style with adaptors)replace all and rails with pulls from a newer style Q45?replace rails and use newer year OEM injectors?

Spending some money now is worth it to avoid trouble later.

I wish everyone thought that way.

[srpim]

what do you mean "the modification"? Did you use Deatsch adaptors, or did you use a newer fuel rail? Do you know what years will fit?

[Fridge]

Yes I used the Deatsch adapter kit with the 91 fuel rails. It is really easy. Dont know why it is missing again the injectors ohm out ok. You should buy mine I probably have 8k in it

[Q451990]

Did you use Deatsch adaptors, or did you use a newer fuel rail? Do you know what years will fit?

90-93 used one style of injector, and the 94-96 used an updated design. The 94-96 will fit but require that they be used in their rails, and they use a different subharness. No word on anything newer than that.

I think the Deatusch adpators are just a way to use the old subharness on the newer style injectors... which seems like a lot of effort vs. just buying an all new subharness for something like $100. There are new 90-93 style injectors on eBay for about $65 each, so I think that's the way I go when mine die from corngas exposure.

Heath

[Q45denver]

I've had several sets failed on my 160K 1990. Two of the injectors on the most recent new set from the dealer failed within 10K miles.

I think the most practical solution is to buy a used fuel rail with injectors and harness for a 94-96 ( I got mine for $100) and have them cleaned and tested by Deatusch werks ( approx. $150). Also you will need to modify the lower runner washers to ensure a proper seal. If you are thinking of buying the Deatusch werks kit I have a new one I could sell you for a substantial discount.

[srpim]

Sorry for the delay in the thread.

Now I am stuck driving the 2002 Buick Century while looking for parts.Anyone have a 94-96 Q set on injectors, rails and harness to sell?

Just for fun I searched some Buick forums..... wow, the questions are dumb! (at least for the newer models; the classics have a decent enthusiast following)Also, there does not seem to be a central place like NICO - the various forumshave small participation and the information is spread between them.

Until I made the comparison, I didn't fully realize what a unique and awesome thing NICO is.

[srpim]

"Modify the lower runner washers" Do you mean a simple trimming of the 1991 washers, or the 1994 washers, or something more than that?