Fuel Injectors

[CaptainBlue]

I had a no start probelm on my 89 Corvette that this forum was able to help me with so I thought I would once again pick your brains.

It was determined that my no start problem was a shorted Fuel Injector. I decided to replace all of them versus the just the one (car has 116K on it with original Injectors). After much review I chose the Accel 24 lb injector. I called several parts places (Auto Zone, Jegs, Summit, Pep Boys) and all of them (without exception) have told me that the 24# injector is a direct factor replacement. After doing some research I found that Accel actually considers the 24 lb injector a Level 2 replacement and the actual stock replacement is a 21 lb injector. I have also read numerous threads on this forum stating that the stock injectors are 22 lbs. My understanding is typically if your stock injectors are 22 you would want to go to a 23 or 24 versus a 21 if 22 was not available.

The question I have is; does anyone here have any expereince in Accel injector performance after installation into a stock motor and what was the outcome? Did it run rich as I've read is possible? Or as I've also read that they work fine especially considering that Accel lists a +/- 1.5 lb flow variation? Bottom line, how do they work in a stock application? Any Experience?

I chose Accel because they seemed to be a good cost effective replacement. I could have opted for a rebuild of the existing injectors (also read good things about that) but I personnally have never had good luck with things being rebuild so I opted for new (personal choice). I have removed the old injectors and I'm waiting on the arrival of the new ones so before I went to the work of installing them only to have the car run funny I thought I would ask what information anyone had on this.

 

[Edmond]

I read a response to this type of question from Hib Halverson and he stated that L98's tend to run rich anyway and unless you have the mods that require the extra fuel, the higher flowing injectors are actually detrimental to performance.

 

[CaptainBlue]

I read a response to this type of question from Hib Halverson and he stated that L98's tend to run rich anyway and unless you have the mods that require the extra fuel, the higher flowing injectors are actually detrimental to performance.

Thanks for the response. I read that thread as well as others that echo his words I also have read just as many that contradict it (not directly) so I'm looking for a concensus from the masses. I guess in a day or two I'll find out myself when I plug them in and fire it up but I was hoping to get a preview of what I might see.

 

[OLDCHEV]

Changed to Accel 24 lb. injectors 4500 miles ago on my 90 Vert, Auto, totally stock MAP system. I have had no problems of any kind. Runs smooth, clean and passed Arizona emissions.

Took a round trip to Oregon and averaged 26.9 MPG. Best move I have made with this car to date. I too was worried about the 24 lb. rating of these injectors. The ECU (computer) with the inputs from the oxygen sensor will narrow the pulse time to keep it as close to 14.7/1 air fuel ratio.

 

[OLDCHEV]

I forgot to say that I changed the Oxygen sensor at the same time to a Bosch unit. With 85,000 miles I figured it was cheap insurance.

 

[CaptainBlue]

Thanks for the feedback. I plan on listing the results on this forum. I was glad to hear someone had tried this and it work well. It was exactly the information I was hoping for. I'll let you know how mine turn out, I should have them tomorrow from Jegs and I should have them in and running no later then Thursday.

 

[vetteboy86]

I dont have a wiring diagram of the circuit for the injectors. However I am not sure why a shorted injector would cause a no start. I think I might pull the schematic up on the internent if it is there. Is there anyone else out their that knows, or has a wiring diagram.

Craig

 

[CaptainBlue]

Hello, OKAY, I've installed the Accel 24# injectors and I also replaced the Cap, Rotor, Plug Wires and Spark Plugs while I was at it. The Car runs great!! It starts right up, idles fine and runs strong. So I'm a happy camper.

Craig, you where also puzzled and had asked questions in the last thread that I started that addressed my initial issue. The thread was titled "1989 Technical Problem...Need Help. dated 13 Sept. You had mentioned that you weren't sure how a shorted injector would cause a no start condition. The new member that helped me solve my problem explained. I think once you find a wiring diagram and trace it, you may see the impact. I'm not an expert mechanic by any means but nine years of being in the Navy and troubleshooting Electronic systems has taught me that shorts can do wierd things to circuits.

 

[vetteboy86]

I am aware of what shorts can do to a circuit. Four years at Purdue in the field of electrical and computer engineering tought me that. I guess I will have to dig up a schematic to put my mind to ease.


Craig

 

[CaptainBlue]

Sorry I couldn't be of more help to you. I'm interested to know what you find out.

 

[vetteboy86]

Yeah it's reallly no biggie, just something I have to find out. I guess everyone has that once in a while.


Craig

 

[jsinga]

the L98 TPI is batch fire, (all go at once 2 times each crank rotation) a short sent the current for all of them to ground.

JS

 

[Blue89]

OK, let me jump on this bandwagon........I just returned from the dealer and they told me that the FI's need replaced because of low OHMs. Didn't say anything about #'s, just that the Vette takes a 17 OHM injector as opposed to other GM's. Haven't read anything about the OHM factor in the threads, what's your take???