Results of a little more testing with this Split Block Learn Values
#1
Racer
Thread Starter
Results of a little more testing with this Split Block Learn Values
Ok after some good advice from you guys , i went back out this morning and just did some normal driving around with the scanner hooked up. This is what i found.
The Left Block / Right Block are usually withen 126-128 (yes both of them) under any kind of throttle whatsoever. Its only when idleing or coasting with no throttle that the Right bank drops to 114-116. If Sitting at idle for a long amount of time it drops down to 110ish.
After pondering this problem for abit, i am gonna start leaning towards a bunk injector. Tell me if this reasoning sounds legit. At idle , or very light throttle , its dumping too much fuel... hence the 110-116 trim. Once you start accelerating or cruzing at decent speeds , the engine RPM actually comes close to matching what the injector is putting out. Hence the very acceptable readings of 126-128. Once you slow back down / idle the situation returns that the injector is dumping too much fuel........ aka bleeding or leaking fuel.
Am i on the right track? And i guess the next question would be, how much are injectors , and are they a pain in the @ss to install?
Cars a 92 for you guys that may or maynot have read the initial thread.
O one more thing, I popped a bottle of injector cleaner in it this morning. Figure it could'nt hurt.
Thanks!
The Left Block / Right Block are usually withen 126-128 (yes both of them) under any kind of throttle whatsoever. Its only when idleing or coasting with no throttle that the Right bank drops to 114-116. If Sitting at idle for a long amount of time it drops down to 110ish.
After pondering this problem for abit, i am gonna start leaning towards a bunk injector. Tell me if this reasoning sounds legit. At idle , or very light throttle , its dumping too much fuel... hence the 110-116 trim. Once you start accelerating or cruzing at decent speeds , the engine RPM actually comes close to matching what the injector is putting out. Hence the very acceptable readings of 126-128. Once you slow back down / idle the situation returns that the injector is dumping too much fuel........ aka bleeding or leaking fuel.
Am i on the right track? And i guess the next question would be, how much are injectors , and are they a pain in the @ss to install?
Cars a 92 for you guys that may or maynot have read the initial thread.
O one more thing, I popped a bottle of injector cleaner in it this morning. Figure it could'nt hurt.
Thanks!
#2
Originally Posted by 92ZR1WANNABE
O one more thing, I popped a bottle of injector cleaner in it this morning. Figure it could'nt hurt.
Sorry, can't help on what it takes to change the injectors, got no exp with LT1's. What you need to do is get them all up and out with the rails still attached to them so you can pressureize the fuel system and look for dripping/leaking injectors...of course if they are the factory Multec's I'd just chit-can them on principal..but that's just me.
Yours are 22# injectors..not exactly a "common" flow rate for aftermarket injectors. Injectors usually run around $200+/set
Got a set of old Multec's I pulled off a 91 if you want them They were working when I pulled them...U pay shipping and they're all yours.
#3
Le Mans Master
Member Since: Jan 2003
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Originally Posted by 92ZR1WANNABE
Ok after some good advice from you guys , i went back out this morning and just did some normal driving around with the scanner hooked up. This is what i found.
The Left Block / Right Block are usually withen 126-128 (yes both of them) under any kind of throttle whatsoever. Its only when idleing or coasting with no throttle that the Right bank drops to 114-116. If Sitting at idle for a long amount of time it drops down to 110ish.
After pondering this problem for abit, i am gonna start leaning towards a bunk injector. Tell me if this reasoning sounds legit. At idle , or very light throttle , its dumping too much fuel... hence the 110-116 trim. Once you start accelerating or cruzing at decent speeds , the engine RPM actually comes close to matching what the injector is putting out. Hence the very acceptable readings of 126-128. Once you slow back down / idle the situation returns that the injector is dumping too much fuel........ aka bleeding or leaking fuel.
Am i on the right track? And i guess the next question would be, how much are injectors , and are they a pain in the @ss to install?
Cars a 92 for you guys that may or maynot have read the initial thread.
O one more thing, I popped a bottle of injector cleaner in it this morning. Figure it could'nt hurt.
Thanks!
The Left Block / Right Block are usually withen 126-128 (yes both of them) under any kind of throttle whatsoever. Its only when idleing or coasting with no throttle that the Right bank drops to 114-116. If Sitting at idle for a long amount of time it drops down to 110ish.
After pondering this problem for abit, i am gonna start leaning towards a bunk injector. Tell me if this reasoning sounds legit. At idle , or very light throttle , its dumping too much fuel... hence the 110-116 trim. Once you start accelerating or cruzing at decent speeds , the engine RPM actually comes close to matching what the injector is putting out. Hence the very acceptable readings of 126-128. Once you slow back down / idle the situation returns that the injector is dumping too much fuel........ aka bleeding or leaking fuel.
Am i on the right track? And i guess the next question would be, how much are injectors , and are they a pain in the @ss to install?
Cars a 92 for you guys that may or maynot have read the initial thread.
O one more thing, I popped a bottle of injector cleaner in it this morning. Figure it could'nt hurt.
Thanks!
Last edited by tjwong; 05-08-2005 at 03:35 PM.
#5
Racer
Thread Starter
Originally Posted by Morley
Got a set of old Multec's I pulled off a 91 if you want them They were working when I pulled them...U pay shipping and they're all yours.
Toss me a PM and well get it worked out!
#6
Instructor
Member Since: May 2003
Location: st louis mo
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I don't think an injector is leaking. THe quickest way to check would be to hook up a fuel pressure gauge. If the pressure bleeds down within a few seconds, you might have a leaking injector.
THe problem is that a factory (or wideband) oxygen sensor will not be able to sense raw fuel through the exhaust. My wideband and factory O2 had no clue the regulator was dumping gas into the intake. Raw fuel was coming out the exhaust. You'll need a 5 gas analyzer for that. Or just smell the tail pipe
I think the best method for split blms is to adjust the fuel trim for each bank. Get those in line and it's all good.
....even though GM doesn't really care about split blms.
THe problem is that a factory (or wideband) oxygen sensor will not be able to sense raw fuel through the exhaust. My wideband and factory O2 had no clue the regulator was dumping gas into the intake. Raw fuel was coming out the exhaust. You'll need a 5 gas analyzer for that. Or just smell the tail pipe
I think the best method for split blms is to adjust the fuel trim for each bank. Get those in line and it's all good.
....even though GM doesn't really care about split blms.
#7
Melting Slicks
Originally Posted by kvu
I think the best method for split blms is to adjust the fuel trim for each bank. Get those in line and it's all good.