Car was sitting for a few years now wont stay running. Gen2 swap. Injectors wont fire - MR2 Owners Club Message Board
 
LinkBack Thread Tools
post #1 of 11 (permalink) Old March 20th, 2019, 14:48 Thread Starter
Registered User
 
Join Date: Nov 2006
Location: San Diego, CA
Age: 36
Posts: 145
OldTrader Rating: (6)
Car was sitting for a few years now wont stay running. Gen2 swap. Injectors wont fire

Car was running fine for a while until i got some body damage. Repaired body damage but have not driven it in a long time.
Car has full ATS TD06 kit with 550 injectors ats fpr and bored rail and the ats rom tune for all these modes.
Greddy Side mount intercooler.
Was NA converted to 3sgte turbo gen 2

Car will start in the mornings but will die with random duration. some days it will run for hours other days it will run for seconds and sometimes will not start. We noticed at the times it wont start that the injectors are not firing.

These are the things we changed before we thought it was an injector problem:
Sparkplugs.
igniter/ignitorcoil

one thing we noticed is when we moved the old sparkplugs around the car started and stayed on for the longest time. so we changes the spark plugs. It was starting consistently for a few days then it went back to the random durations.


Tested for spark
We tried cleaning the Iacv valve. that was working.
We thought it could be a boost leak but could not find one
We checked fuel pump and fuel pressure. all is good. even emptied out the whole tank by jumpering the diag port and disconnecting the banjo bolt that connects to the fuel rail.
Tried swapping to a stock ecu.

I noticed that the signal indicators/hazards dont flash properly also. Could a grounding problem cause my car to not stay on?

I don't know what else to check.

-------------------

UPDATE: the Second ecu is different from the one that was on the car. My dumbass thought it was interchangeable. the second ecu has a different part number. its for 91 usdm the one i have on the car is for 93 usdm.
That is why when i swapped ecus it still didnt work.

I found the thread about leaking caps. So i opened my ecu and found 3 leaking caps C810 C500 C512. I already have the caps on order and should be here thursday. Im crossing my fingers this is the problem.

BUT I also found what i think is a resistor that is also busted that may need to be replaced. I need help Identifying it so I can replace it.

Its the light blue one in the middle of this picture. it looks kind of burnt and it looks like there is some residue underneath it. This one is close to the C810 capacitor. Please help me Identify or let me know if its still ok.
https://drive.google.com/file/d/105S...ew?usp=sharing

what i might end up doing is just replace the capacitors and see if it works after that. Would there be any issues if i did that first?

Last edited by jollib; May 6th, 2019 at 22:18. Reason: title fix
jollib is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old March 27th, 2019, 19:53
Registered User
 
Join Date: Mar 2004
Location: Calgary, Alberta, Canada
Posts: 4,198
OldTrader Rating: (45)
Yes definitely clean all the ground points.
AFM not opening or elect issues?
mr2_mike is online now  
post #3 of 11 (permalink) Old March 28th, 2019, 11:33 Thread Starter
Registered User
 
Join Date: Nov 2006
Location: San Diego, CA
Age: 36
Posts: 145
OldTrader Rating: (6)
Quote:
Originally Posted by mr2_mike View Post
Yes definitely clean all the ground points.
AFM not opening or elect issues?
i tried disconnecting the afm. if the afm was the problem the car still should start right but with just a rough idle right? or am i misunderstanding how to test the afm?
jollib is offline  
Sponsored Links
Advertisement
 
post #4 of 11 (permalink) Old March 29th, 2019, 20:27
Registered User
 
Join Date: Mar 2004
Location: Calgary, Alberta, Canada
Posts: 4,198
OldTrader Rating: (45)
AFM disconnected the engine will die right away. air suction pulls flapper open, amount open allows ecu to know the amount of air into motor and adjusts fuel accordingly.

1991 MR2 BGB Online - Mechanical - EFI System

Specifically:
http://mr2.ie/mr2/bgb/mk2/mechanical..._0448_0001.jpg

For this reason:
http://mr2.ie/mr2/bgb/mk2/mechanical..._0333_0001.jpg
mr2_mike is online now  
post #5 of 11 (permalink) Old April 17th, 2019, 10:18 Thread Starter
Registered User
 
Join Date: Nov 2006
Location: San Diego, CA
Age: 36
Posts: 145
OldTrader Rating: (6)
i think it test the afm correctly. per bgb. thanks for that. the resistance fluctuates when opening the flap. we fixed the growding issues so the lights work now but still not pulse. well there is a pulse but is constant. could this be a problem with the distributor. should i replace that or the wires that send the cam signal.

one more thing how do i rule out the TPS. will the car stay running if you unplug the TPS? i could not find that test in the bgb. maybe im not looking right.

Thank you guys for your help. i think im getting close. i have a used distributor on order but dont know how long it will take to get here but if there are things to do or check without replacing the distributor please let me know.
jollib is offline  
post #6 of 11 (permalink) Old April 24th, 2019, 23:14 Thread Starter
Registered User
 
Join Date: Nov 2006
Location: San Diego, CA
Age: 36
Posts: 145
OldTrader Rating: (6)
so i pulled the distributor out and noticed that the distributor cables are exposed. Could this be the culprit? im ordering a pigtail to replace it. I am hoping is the issue. Have a damaged anything else if these cables were shorting?
jollib is offline  
post #7 of 11 (permalink) Old April 24th, 2019, 23:30
Registered User
 
Join Date: Mar 2004
Location: Calgary, Alberta, Canada
Posts: 4,198
OldTrader Rating: (45)
Probably lucky and not wrecked anything. I think you'd blow a fuse if they grounded out. Worst case a new ecu but let's not jump to that conclusion just yet.
Fix that plug because if it's not fully plugged in that can cause your intermittent running issues.
Have seen that plug busted on a few cars for whatever reason.
Look up how to repin that plug. There's a technique to get the pins out.
mr2_mike is online now  
post #8 of 11 (permalink) Old May 5th, 2019, 16:24 Thread Starter
Registered User
 
Join Date: Nov 2006
Location: San Diego, CA
Age: 36
Posts: 145
OldTrader Rating: (6)
so i fixed the cables with a new pigtail. still no injector pulse. both injector cables both show solid 12v with led tester.
im getting spark so the distributor would not be a problem correct?

i think this problem is similar to this thread https://www.mr2oc.com/61-3sgte-turbo...-firing-2.html

i have second ecu and tested it, still not working.

I checked the ground for the injectors on the intake manifold to make sure it was grounded. i even tried to by pass the ground point by using a long jumper cable directly to the battery.

Im starting to think both my main and my spare ecu is bad. Can these be repaired?

I got a used distributor online but it came with a cracked housing so i need to return that. so i cant use that to test if its a distributor problem. can distributors go bad?
jollib is offline  
post #9 of 11 (permalink) Old May 6th, 2019, 22:15 Thread Starter
Registered User
 
Join Date: Nov 2006
Location: San Diego, CA
Age: 36
Posts: 145
OldTrader Rating: (6)
UPDATE: the Second ecu is different from the one that was on the car. My dumbass thought it was interchangeable. the second ecu has a different part number. its for 91 usdm the one i have on the car is for 93 usdm.
That is why when i swapped ecus it still didnt work.

I found the thread about leaking caps. So i opened my ecu and found 3 leaking caps C810 C500 C512. I already have the caps on order and should be here thursday. Im crossing my fingers this is the problem.

BUT I also found what i think is a resistor that is also busted that may need to be replaced. I need help Identifying it so I can replace it.

Its the light blue one in the middle of this picture. it looks kind of burnt and it looks like there is some residue underneath it. This one is close to the C810 capacitor. Please help me Identify or let me know if its still ok.
https://drive.google.com/file/d/105S...ew?usp=sharing

what i might end up doing is just replace the capacitors and see if it works after that. Would there be any issues if i did that first?

Last edited by jollib; May 6th, 2019 at 22:18.
jollib is offline  
post #10 of 11 (permalink) Old May 7th, 2019, 01:09 Thread Starter
Registered User
 
Join Date: Nov 2006
Location: San Diego, CA
Age: 36
Posts: 145
OldTrader Rating: (6)
Another update. I think the resistor(not sure if its a resistor because there are not color bands) is for EGR. My motor is a JDM motor so i should be fine.

In this picture(front) i show the possible busted component(yet to identify what it is)(light blue circled red) and the pin it may be connected to. Notice its the 6th pin from the buttom of that connector
https://drive.google.com/file/d/1oBw...ew?usp=sharing

In this is the (back) of the pcb. the big circle is the resistor pins. one end has a trace that goes to pin 6 from the top(reversed from the other picture)
So based on that. the 6th pin on the front picture is the EGR pin.
https://drive.google.com/file/d/1zZM...ew?usp=sharing

So my question is i should be fine not fixing this for now since my motor does not have egr.
My other question is can some identify what that component is so i can go buy it. It looks similar to another one on the ecu but the markings are slightly different.
jollib is offline  
post #11 of 11 (permalink) Old May 10th, 2019, 10:55
Registered User
 
Join Date: Nov 2008
Age: 67
Posts: 172
OldTrader Rating: (4)
The following is based on my 93T ECU, but this portion matches yours.

1) The "burned" resistor is identified as R851 on my PCB. My resistor is marked as 3R9J, which I have correlated with a 3.9 ohm resistor. The 3R9J come in different wattages but mine is specifically labeled as 1 watt.

2) I agree that this resistor traces back to the EGR pin. I concur with your conclusion is that this does not need to be replaced if you do not have an EGR.
tdaustinmr2 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MR2 Owners Club Message Board forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: (0 members)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome