Need injector help ASAP
Thread Starter
Racer
Joined: Oct 2004
Posts: 286
Likes: 1
From: Washington DC
Need injector help ASAP
Hey everybody.
I replaced my stock injectors about 2 months ago (had a couple that were leaking.) I went with a set of 24lb/hr accels (that was the flow rate accel recommended for a TPI setup.)
Stock injectors are 22 lb/hr .... so why did they tell me to get injectors that flow 2lb/hr faster? My vehicle is running like crap. Idles real rough, block learn is around 108 or so, so the ECM can't compensate for whatever extra fuel I'm getting.
I am installing an AFPR tonight, to try and help my situation out a little bit - IE i'll bump back rail pressure to try and lean my vehicle out a little bit - the accels flow 24.3 lb/hr @ 43.5 psi - what PSI are GM injectors rated at? How much should I bump off the pressure to get the injector to behave something like a 22lb/hr would?
help ASAP would be appreciated, as I'm leaving for the shop in a few hours. TIA.
-pablo
I replaced my stock injectors about 2 months ago (had a couple that were leaking.) I went with a set of 24lb/hr accels (that was the flow rate accel recommended for a TPI setup.)
Stock injectors are 22 lb/hr .... so why did they tell me to get injectors that flow 2lb/hr faster? My vehicle is running like crap. Idles real rough, block learn is around 108 or so, so the ECM can't compensate for whatever extra fuel I'm getting.
I am installing an AFPR tonight, to try and help my situation out a little bit - IE i'll bump back rail pressure to try and lean my vehicle out a little bit - the accels flow 24.3 lb/hr @ 43.5 psi - what PSI are GM injectors rated at? How much should I bump off the pressure to get the injector to behave something like a 22lb/hr would?
help ASAP would be appreciated, as I'm leaving for the shop in a few hours. TIA.
-pablo
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 0
From: High Plains Drifter Fayetteville, AR
I'm surprised your having that much of a fueling problem with 24Lb injectors. You'll probably have to drop the pressure down about 5Lbs, which I believe is the limit of the regulator. Accel injectors do not have a great reputation, they seem to have a high failure rate. Stock injectors are rated at 43Lbs pressure.
Only problem with dropping the pressure is it effects the spray pattern of the injectors.
Only problem with dropping the pressure is it effects the spray pattern of the injectors.
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
The stock fuel pressure on my "91" Vettes "Multec" fuel injectors measure 50lbs with the vacuum line removed and plugged from the fuel pressure regulator and 40lbs with the vacuum line attached.
These readings are the stock settings from the factory and the L98 engine runs and idles very smooth with 53k miles on it.
These readings are the stock settings from the factory and the L98 engine runs and idles very smooth with 53k miles on it.
Drifting
Joined: May 1999
Posts: 1,478
Likes: 3
From: Sacramento, CA Money can't buy happiness - but it's more comfortable to cry in a Corvette than a Yugo.
Originally Posted by C4Ownr24
Hey everybody.
I replaced my stock injectors about 2 months ago (had a couple that were leaking.) I went with a set of 24lb/hr accels (that was the flow rate accel recommended for a TPI setup.)
Stock injectors are 22 lb/hr .... so why did they tell me to get injectors that flow 2lb/hr faster? My vehicle is running like crap. Idles real rough, block learn is around 108 or so, so the ECM can't compensate for whatever extra fuel I'm getting.
I am installing an AFPR tonight, to try and help my situation out a little bit - IE i'll bump back rail pressure to try and lean my vehicle out a little bit - the accels flow 24.3 lb/hr @ 43.5 psi - what PSI are GM injectors rated at? How much should I bump off the pressure to get the injector to behave something like a 22lb/hr would?
I replaced my stock injectors about 2 months ago (had a couple that were leaking.) I went with a set of 24lb/hr accels (that was the flow rate accel recommended for a TPI setup.)
Stock injectors are 22 lb/hr .... so why did they tell me to get injectors that flow 2lb/hr faster? My vehicle is running like crap. Idles real rough, block learn is around 108 or so, so the ECM can't compensate for whatever extra fuel I'm getting.
I am installing an AFPR tonight, to try and help my situation out a little bit - IE i'll bump back rail pressure to try and lean my vehicle out a little bit - the accels flow 24.3 lb/hr @ 43.5 psi - what PSI are GM injectors rated at? How much should I bump off the pressure to get the injector to behave something like a 22lb/hr would?
I suspect you have something besides the injector flow change causing your problem. Did you reset the ECM and have you done anything to upset the Throttle Position Sensor or IAC? What are those reading?
It is always possible that you got a bad injector new out of the box. One might be sticking open or shorted.
Safety Car
Joined: Dec 2004
Posts: 4,088
Likes: 0
From: Poop land
Originally Posted by C4Ownr24
Hey everybody.
I replaced my stock injectors about 2 months ago (had a couple that were leaking.) I went with a set of 24lb/hr accels (that was the flow rate accel recommended for a TPI setup.)
Stock injectors are 22 lb/hr .... so why did they tell me to get injectors that flow 2lb/hr faster? My vehicle is running like crap. Idles real rough, block learn is around 108 or so, so the ECM can't compensate for whatever extra fuel I'm getting.
I am installing an AFPR tonight, to try and help my situation out a little bit - IE i'll bump back rail pressure to try and lean my vehicle out a little bit - the accels flow 24.3 lb/hr @ 43.5 psi - what PSI are GM injectors rated at? How much should I bump off the pressure to get the injector to behave something like a 22lb/hr would?
help ASAP would be appreciated, as I'm leaving for the shop in a few hours. TIA.
-pablo
I replaced my stock injectors about 2 months ago (had a couple that were leaking.) I went with a set of 24lb/hr accels (that was the flow rate accel recommended for a TPI setup.)
Stock injectors are 22 lb/hr .... so why did they tell me to get injectors that flow 2lb/hr faster? My vehicle is running like crap. Idles real rough, block learn is around 108 or so, so the ECM can't compensate for whatever extra fuel I'm getting.
I am installing an AFPR tonight, to try and help my situation out a little bit - IE i'll bump back rail pressure to try and lean my vehicle out a little bit - the accels flow 24.3 lb/hr @ 43.5 psi - what PSI are GM injectors rated at? How much should I bump off the pressure to get the injector to behave something like a 22lb/hr would?
help ASAP would be appreciated, as I'm leaving for the shop in a few hours. TIA.
-pablo
Instructor
Joined: May 2004
Posts: 183
Likes: 0
From: Queens NY
I have the accel 24 injectors in my 90 vette for 6 months now and they are great no problems here i think the car performs well with these over the stock injectors. Just installed them and fired up the car.
