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Username Post: 94 z28 starting issue        (Topic#346194)
173rdherd 
"13 Year" Gold Supporting Member
Posts: 385
173rdherd
Loc: BLACK DIAMOND BAY(tomball...
Reg: 11-29-04
07-24-17 09:39 AM - Post#2701191    

changed topic.....

94 Z-28 Ram Air
76 el camino (Elke)
58 4 dr Yeoman (Nadine)
57 4 dr 150 (Dottie)
53 4 dr tradesman (Tupelo Honey)
and they're all....
Positively Fourth Street.



Edited by 173rdherd on 05-12-18 07:43 AM. Reason for edit: No reason given.

 




173rdherd 
"13 Year" Gold Supporting Member
Posts: 385
173rdherd
Loc: BLACK DIAMOND BAY(tomball...
Reg: 11-29-04
07-25-17 07:07 AM - Post#2701341    
    In response to 173rdherd

I got a response from rock auto and they said its a weld on deal, good news is they are only charging $18 for return shipping on tank and issuing refund.

I wish people would post more about problems they encounter on these cars, even when they solve the problem themselves.....it's one of the things that really make this place rock!

94 Z-28 Ram Air
76 el camino (Elke)
58 4 dr Yeoman (Nadine)
57 4 dr 150 (Dottie)
53 4 dr tradesman (Tupelo Honey)
and they're all....
Positively Fourth Street.



 
77chevy 
Valued Contributor
Posts: 3601
77chevy
Loc: trusting earth to a boys ...
Reg: 01-26-01
07-28-17 06:25 PM - Post#2701883    
    In response to 173rdherd

sorry days late.

hope you enjoy the 6speed and its fun for you.

you know the fuel pump can be accessed by cutting the trunk floor. measurements can be found online for lt1 vs ls1

if you want a solid drag hook for cheap find the mythical softer v6 springs and cheapo 3rd gen rear shocks. you could score some cheap lower control arm weld on brackets to lay the lower control arms level. make sure the unit is good in the rear and if it isnt go with the yukon units. this setup will not handle but will hook.





Edited by 77chevy on 07-28-17 06:32 PM. Reason for edit: No reason given.

 
173rdherd 
"13 Year" Gold Supporting Member
Posts: 385
173rdherd
Loc: BLACK DIAMOND BAY(tomball...
Reg: 11-29-04
11-15-17 07:06 PM - Post#2714557    
    In response to 77chevy

finally got back to this project, buttoned up fuel system went to start and security light. evidently the pellet in my key is dead. I know how to find the resistor value when the key is good....but how do I find which one of the 15 different pellets I need when the key is bad?
also....you mean a full size Yukon rearend? I have a 2002 coming available soon. Taking the motor and trans for the 58.....just realized you meant Yukon brand!

94 Z-28 Ram Air
76 el camino (Elke)
58 4 dr Yeoman (Nadine)
57 4 dr 150 (Dottie)
53 4 dr tradesman (Tupelo Honey)
and they're all....
Positively Fourth Street.



Edited by 173rdherd on 11-15-17 07:07 PM. Reason for edit: No reason given.

 
jktucker92 
Silver Supporting Member
Posts: 173
jktucker92
Reg: 02-05-17
11-20-17 02:56 PM - Post#2715108    
    In response to 173rdherd

Is the pellet in the key actually bad, or is it the wiring from the lock to the BCM? I just replaced my lock on my '99 and the problem was a broken wire to the ignition lock. I was able to get the resistor value by measuring the pellet in the key itself. If the pellet is the key is missing or broken, then the only way I can think of is to just try all the options until it works.



 
173rdherd 
"13 Year" Gold Supporting Member
Posts: 385
173rdherd
Loc: BLACK DIAMOND BAY(tomball...
Reg: 11-29-04
12-20-17 05:16 PM - Post#2718598    
    In response to jktucker92

sorry for so late.....I think the pellet is bad, but don't know how to find out which one it is

94 Z-28 Ram Air
76 el camino (Elke)
58 4 dr Yeoman (Nadine)
57 4 dr 150 (Dottie)
53 4 dr tradesman (Tupelo Honey)
and they're all....
Positively Fourth Street.



 
jktucker92 
Silver Supporting Member
Posts: 173
jktucker92
Reg: 02-05-17
01-12-18 12:13 PM - Post#2720864    
    In response to 173rdherd

Sorry, just noticed this post. Not sure why I didn't see it sooner. Usually the failure is in the ignition switch, not the pellet, but it's not unheard of to have the pellet break.
Without a valid pellet in the key, you may have to resort to trial and error with the resistance value. You can buy a set of the possible resistors online. They're often used for remote start systems. They make a bypass key, which will allow you to connect it to each resistor and try them. Look online for instructions on how to do this.



 
173rdherd 
"13 Year" Gold Supporting Member
Posts: 385
173rdherd
Loc: BLACK DIAMOND BAY(tomball...
Reg: 11-29-04
03-20-18 06:11 AM - Post#2728258    
    In response to jktucker92

was off the project for a while, but just got a key from the swap meet.....cranks great now, but no start. will run on carb cleaner spray in the intake. checked fuses. 3/4 tank of gas, new pump, tank, and filter.

94 Z-28 Ram Air
76 el camino (Elke)
58 4 dr Yeoman (Nadine)
57 4 dr 150 (Dottie)
53 4 dr tradesman (Tupelo Honey)
and they're all....
Positively Fourth Street.



 
173rdherd 
"13 Year" Gold Supporting Member
Posts: 385
173rdherd
Loc: BLACK DIAMOND BAY(tomball...
Reg: 11-29-04
03-26-18 08:34 AM - Post#2728985    
    In response to 173rdherd

Still no help??....found fuel pump relay under foot rest, replaced it and it almost fired first try then nothing. was only a 4 pin relay, most i have seen are 5


94 Z-28 Ram Air
76 el camino (Elke)
58 4 dr Yeoman (Nadine)
57 4 dr 150 (Dottie)
53 4 dr tradesman (Tupelo Honey)
and they're all....
Positively Fourth Street.



 
jktucker92 
Silver Supporting Member
Posts: 173
jktucker92
Reg: 02-05-17
03-26-18 08:21 PM - Post#2729059    
    In response to 173rdherd

Do you hear the fuel pump run when you turn the key on? It should, to pressurize the fuel rail before it starts. I'm not sure about the VATS on the '94. On my '99, it won't even crank if the BCM doesn't see the right key. However, on a '92, the VATS will disable the fuel pump. The other way to check for fuel pressure is to briefly press the scrader valve on the fuel rail. It should spray gas if there's pressure. If you turn the key to ON (don't start) and the security lamp does not go off after some seconds go by, it is likely not reading the resistance of the key. I had to replace the lock cylinder in my '99. You can also put the right resistor in the wiring to bypass the key and cylinder.



 
173rdherd 
"13 Year" Gold Supporting Member
Posts: 385
173rdherd
Loc: BLACK DIAMOND BAY(tomball...
Reg: 11-29-04
05-09-18 09:08 AM - Post#2733504    
    In response to jktucker92

thanks for the reply (been gettin the elky ready for PT2018).....I can't hear the pump prime but i hear the relay click and the security light goes out. somebody told me an oil pressure switch could be bad and this might kill the fuel pump.....it cranks plenty good with the new key.


94 Z-28 Ram Air
76 el camino (Elke)
58 4 dr Yeoman (Nadine)
57 4 dr 150 (Dottie)
53 4 dr tradesman (Tupelo Honey)
and they're all....
Positively Fourth Street.



 
jktucker92 
Silver Supporting Member
Posts: 173
jktucker92
Reg: 02-05-17
05-14-18 07:35 AM - Post#2733938    
    In response to 173rdherd

Oil pressure switches were used on TBI and TPI engines. I'm not sure if they were used on the LT-1 engines, but I'm pretty sure they're not on the LSx engines. They are there to provide an alternative power source for the fuel pump that would run the pump when the engine had oil pressure. I believe this was for the limp home mode. If the ECU failed in certain ways, the limp home mode would allow the engine to run.
Bottom line is that the oil pressure switch was a backup plan to run the fuel pump. If it failed, it wouldn't prevent the fuel pump from being run by the ECU. Therefore, a faulty oil pressure switch would not prevent the engine from running.
The next thing I'd check is whether there was pressure at the fuel rail. If you have a fuel pressure gauge, you should be able to connect it to the schrader valve on the fuel rail. If you don't have a gauge, you can press the valve and see if gas comes out under pressure. Obviously, use caution with this method since fuel will be sprayed on the top of the engine and could start a fire if you're not careful. If you don't have good pressure, it could be the pressure regulator, or faulty wiring to the fuel pump.



 




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