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ron_schaadt
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Feb 15, 2012, 5:07 PM
Post #26 of 42
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Re: 1988 toyota camry
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mine is unplugged and is still flooding out within 3 sec
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Hammer Time
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Feb 15, 2012, 5:10 PM
Post #27 of 42
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Re: 1988 toyota camry
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Put a fuel pressure gauge on it and see if it's holding rest pressure.
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Discretesignals
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Feb 15, 2012, 5:14 PM
Post #28 of 42
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Re: 1988 toyota camry
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There is something wrong with the service information. I'm reading about toyota injectors and the low resistance injector that didn't have an external resistor and used a current controlled driver was used on the 4a-GE and wasn't sold in the states.
The high resistance injectors didn't use an external resistor and low resistance injectors did. The service information in Alldata states that the injector resistance is supposed to be around 1.6 ohms, but the wiring schematic doesn't show the external resistors. Which makes you think they are using high resistance injectors.
Take a look at the schematic and you'll see what I mean, HT.
What you could do is measure the resistance of the harness to see if there is an external resistor. If you use low resistance injectors without an external resistor, it will burn up the drivers or injector coils.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 15, 2012, 5:25 PM)
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Discretesignals
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Feb 15, 2012, 5:21 PM
Post #29 of 42
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Re: 1988 toyota camry
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This is taken for the toyota tech training manual for injector operation.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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ron_schaadt
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Feb 15, 2012, 5:21 PM
Post #30 of 42
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Re: 1988 toyota camry
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ok sounds like i confused you here ill start from scratch and let you know what i have and what i have done the injectors i do have are the 2 ohms i have unplugged the cold start injector have pulled the fuel rail out and installed the injectors turned over the engine to see if they sprayed they streamed then found out that injectors have two types of wires and 1 and 3 get one of each same with 2 and 4 after redoing the installation of the injector plugs they quit pissing and started spraying we then re installed the rail and injectors and turned the key it started for a sec we shut it down and drained the oil due to all of the prior flooding had ran fuel down past the rings into the oil and it smelled strong of fuel then we tried to start again and that is when it started to foul out the plugs with fuel we would remove the plugs blow them dry with compressed air alow the cylinders to dry out and reinstall plugs then turn key right away it would try to fire then foul out again with fuel. this is where im at at the present
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Hammer Time
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Feb 15, 2012, 5:35 PM
Post #31 of 42
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Re: 1988 toyota camry
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You haven't confused us, you are just not being thorough enough and jumping around with theories
DS
Yes, there seems to be some conflicting info even in Alldata.
If you looking under testing for the injector, there are 2 parts, one for the circuit and one for the injector itself. Under the injector itself it shows a resistance spec of 1.61 ohm but if you go to the circuit test, you find this.
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ron_schaadt
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Feb 15, 2012, 5:45 PM
Post #32 of 42
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Re: 1988 toyota camry
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we have ran into the same issue at his shop he has a program that deals with Mitchel and it is also confusing that is why im on here trying to get answers from people who know about this stuff this is the first time i have had to deal with injectors and already im not liking them lol
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Discretesignals
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Feb 15, 2012, 5:48 PM
Post #33 of 42
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Re: 1988 toyota camry
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So, which injector 1.6 ohm or 14 ohm? Wiring diagram doesn't show resistors, so it should be 14 ohm. He needs to ohm out the harness to see if there is actually external resistors. If you have the 1.6 ohms in there without the ext resistors, your going to have problems with burning things up.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 15, 2012, 5:49 PM)
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ron_schaadt
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Feb 15, 2012, 5:48 PM
Post #34 of 42
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Re: 1988 toyota camry
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no did not see that but it will help out thanks for all of your help
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ron_schaadt
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Feb 15, 2012, 5:53 PM
Post #35 of 42
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Re: 1988 toyota camry
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the injectors in the car at the moment test out at 2 ohms right now the 14 ohms are the ones we removed the car sat for two years before i got it due to an injector not firing we tested them after pulling them and 2 tested at 8 ohms and 2 tested at 14ohms that is when i went to the wrecking yard and got the 4 new that tested at 2 ohms across the board which are now in the car does this clear it up
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Discretesignals
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Feb 15, 2012, 6:00 PM
Post #36 of 42
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Re: 1988 toyota camry
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If they had 14 ohms in there and you installed 2 ohms, it will cook the driver circuits. The drivers are not designed to handle that kind of current. It is possible that you may have taken out the original and the replacement ECUs.
Since each driver handles two injectors that are wired in parallel that means the total resistance in the circuit with 1.6 ohm injectors without external resistance is:
1/R=1/R+1/R
1/R=1/1.6+1/1.6
1/R= 0.625+0.625
1/R=1.25
R=.8 ohms
The current flowing through the circuit including the driver with a charging system voltage of 13.5 V would be:
I=E/R
I=13.5/0.8
I=16.9 amps
With 14 ohm injectors the resistance in one driver circuit would be:
1/R=1/R+1/R
1/R=1/14+1/14
1/R=.071=.071
1/R=0.142
R= 7 ohms
Current in circuit at 13.5 V would be:
I=E/R
I=13.5/7
I=1.9 amps
17 amps versus 1.9 amps = hot driver and coils
So, you can see that the lower resistance injector will use more current. That is why the external resistor is used with the low resistance injector with a voltage controlling driver.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 15, 2012, 6:25 PM)
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ron_schaadt
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Feb 15, 2012, 6:08 PM
Post #37 of 42
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Re: 1988 toyota camry
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they are $23 at the wrecking yard so being there is the 2 ohms injectors in now i will go look for a ecu running 2ohm injectors also our sources say the ecu has to be for an 1988 cant be from any other year for they dont inter change i'll have to match ecu with injectors
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Hammer Time
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Feb 15, 2012, 6:13 PM
Post #38 of 42
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Re: 1988 toyota camry
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No, no, no............ Don't try to go down that road. Just put the right injectors in the car.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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ron_schaadt
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Feb 15, 2012, 6:18 PM
Post #39 of 42
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Re: 1988 toyota camry
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while we had the injectors out we checked for leaks the only time they would spray is during cranking mode other than that they are dry
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ron_schaadt
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Feb 15, 2012, 6:21 PM
Post #40 of 42
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Re: 1988 toyota camry
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the only problem i have with that is the original ecu is the one that fried and the replacement one we have no idea on what injectors it was running could have been the 14 ohms or the 2 ohms we dont know
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Hammer Time
Ultimate Carjunky
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Feb 15, 2012, 6:21 PM
Post #41 of 42
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Re: 1988 toyota camry
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Again, incomplete testing. This is just going in circles because of the way you are approaching things. I'm going to bail out. DS can continue if he wants to.
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Discretesignals
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Feb 15, 2012, 6:33 PM
Post #42 of 42
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Re: 1988 toyota camry
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You need to install the 14 ohm injectors that the car originally came with. The ECU doesn't matter when it comes to which injectors are used. Its the two different system injectors that matter. Just get the correct ECU for the vehicle. Honestly I would stay out of the junk yard for injectors.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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