stalling....

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Sep 21, 2008 | 07:59 PM

mattsoltesz

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From: Pemberton NJ

stalling....

I have a 86 and 2 problems. When I go to start it it starts and then stalls....This happens for 3 or 4 times and then it stays running and idols fine. After that it stalls everytime I put it in gear it will stall out. Any hints??

oh...its a auto trans

Sep 21, 2008 | 08:27 PM

engle1147

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From: Tampa Florida

Check your car for ECM trouble codes first.....if no stored codes are found a good place to start is to do a fuel pressure check at the fuel rail.

Sep 22, 2008 | 08:42 AM

mattsoltesz

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From: Pemberton NJ

ok...im a newbe...forgive me....how do you check the fuel pressure at the rail?

Sep 22, 2008 | 09:36 AM

AGENT 86

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From: Summerland B.C. Canada

Buy a pressure gage and hose that will screw onto shrader valve on fuel rail.
Check for stored codes.
Your IAC could also be an area of concern. Read these.

http://members.shaw.ca/corvette86/Co...0View%2086.pdf
http://members.shaw.ca/agent86/IAC%20Diagnosis.pdf
http://members.shaw.ca/corvette86/Fu...mDiagnosis.pdf
http://members.shaw.ca/corvette86/No...it%20Check.pdf

Sep 22, 2008 | 10:03 AM

mattsoltesz

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From: Pemberton NJ

Awesome info!! Thanks! Any suggestions on a halfway decent diagnostic tool? Most of the ones I have seen are from 1996 and newer...

Sep 22, 2008 | 10:08 AM

AGENT 86

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From: Summerland B.C. Canada

If your looking for something to pull the codes from the ECM, all you need is a paper clip to jump terminals "A" and "B", on the ALDL connector.
Jump terminals, turn ignition to "RUN" and then watch the "SES" light on the info panel. http://members.shaw.ca/corvette86/No...it%20Check.pdf

Sep 22, 2008 | 10:12 AM

AGENT 86

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From: Summerland B.C. Canada

I should add that the SES light will flash on and off, to give the codes.
Example- flash-pause-flash-flash is code 12(ECM is communicating)
Example-flash-flash-flash-pause-flash-flash-flash-flash is code 34.

Sep 22, 2008 | 12:02 PM

mattsoltesz

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From: Pemberton NJ

Sounds easy enough....is there a list somewehre that will tell me what the codes mean??

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Sep 22, 2008 | 12:22 PM

bjankuski

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From: Glenbeulah Wi

Quote:

Originally Posted by mattsoltesz

Sounds like your minimium idle speed is set too low. GM had a service note to make sure the idle speed was at least 450 RPM in drive with the IAC completely closed so you did not experience stalling when the car was put in drive.

Basically you do this:
-Warm car up
-Jump the a-b termanuals on the diagnostic connector
-Turn the key on
-Disconnect the IAC at the throttle body
-Turn key off
-pull out jumper at diagnostic connector
-Start car and see if it will idle at 450 to 500 RPM in drive
-If RPM is too low adjust the set screw that holds the throttle blades open out farther until the desired RPM is reached.
-Readjust throttle position sensor to .52 volts at idle
-Reconnect IAC and car should not stall any more when going into gear.

Sep 22, 2008 | 03:12 PM

#10

AGENT 86

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From: Summerland B.C. Canada

Quote:

Originally Posted by mattsoltesz

Sounds easy enough....is there a list somewehre that will tell me what the codes mean??

The code flow charts are on my site.

http://members.shaw.ca/corvette86/

Sep 22, 2008 | 04:57 PM

#11

pmihaltian

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Joined: Dec 2001

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From: Charlotte NC

Quote:

Originally Posted by mattsoltesz

Awesome info!! Thanks! Any suggestions on a halfway decent diagnostic tool? Most of the ones I have seen are from 1996 and newer...

Do you have a laptop computer? If so, I recommend Tunerpro (free) and a USB ALDL cable @$60. Another choice for reading the aldl datastream is winaldl (also free). You will still need the aldl cable which will also allow you to read codes and datalog the info using your laptop computer. There is also info on this site about constructing your own aldl cable if your handy w/a soldering iron.

http://winaldl.joby.se/
http://tunerpro.markmansur.com/
http://aldlcables.com/

Good Luck!

Sep 24, 2008 | 08:24 AM

#12

mattsoltesz

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From: Pemberton NJ

I tried using the jumper (a paperclip) for ports A and B on the diagnostic terminal but nothing happens. The service engine soon light just stays on..

Sep 24, 2008 | 08:38 AM

#13

AGENT 86

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From: Summerland B.C. Canada

Are you sure they was a good connection between A and B ??
http://members.shaw.ca/corvette86/SE...n%20Steady.pdf

Sep 24, 2008 | 08:46 AM

#14

mattsoltesz

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From: Pemberton NJ

yep....A & B are on the top row the ones furthest to the right (passenger side) correct??

Sep 24, 2008 | 08:47 AM

#15

AGENT 86

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From: Summerland B.C. Canada

Correct. Follow the flow chart in the link.

Sep 24, 2008 | 08:49 AM

#16

mattsoltesz

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From: Pemberton NJ

It says go to chart A-2....i dont have that one

Sep 24, 2008 | 08:52 AM

#17

mattsoltesz

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From: Pemberton NJ

Do i have to disconnect the ECM from behind the dash?

Sep 24, 2008 | 09:15 AM

#18

mattsoltesz

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From: Pemberton NJ

Ok.,....I did all that...disconnected the ECM....turned ingition on and no light....next step is to "backprobe ECM ckt 451".....huh???

Sep 24, 2008 | 09:47 AM

#19

AGENT 86

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From: Summerland B.C. Canada

Quote:

Originally Posted by mattsoltesz

Ok.,....I did all that...disconnected the ECM....turned ingition on and no light....next step is to "backprobe ECM ckt 451".....huh???

Take a test light(connected to ground) and make contact (with probe)with terminal A9 on ECM connector(ECM plugged in)

Sep 24, 2008 | 10:13 AM

#20

QBLU92

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From: Chesterfield Twp Mi

Quote:

Originally Posted by mattsoltesz

yep....A & B are on the top row the ones furthest to the right (passenger side) correct??

Yes, you are correct. If you just checking for codes, leave everything connected like it should. You put a piece of wire/paperclip whatever, in ports A and B. Turm the key so just the ignition is on. Watch the check engine light. it will Blink 1 time pause and then blink 2 times ( this is a code 12, means its reading correctly) and it will do this 3 consecutive times. Then if any codes are present they will flash now, ( i have a bad optispark which is a code 36 so after the 3 code 12's it will flash 3 times, pause and flash 6 times also doing this 3 times) then after it flashes the codes it will flash the code 12 three times again to indicate it has provided all codes. If it flashes 12 three times then 12 again 3 times you have NO codes set. To clear codes and check again remove the NEGITIVE battery cable, that will clear them. Hope this helps!!

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