Timing jump!

KenneBell

New Member

Apr 14, 2005

158

0

0

San Jose California

Aug 12, 2006

#1

• Aug 12, 2006

• #1

88 Turbocoupe motor in my 92 stang and it started pinging when I get on it now. I thought at first it was bad gas, I decided to check my timing. Took the spout out and it is at 10 degrees btdc, I then retarded it with spout out to 7. I then put the spout back in and started the car up, the timing showed about 16 degrees, I then reved the engine and the timing mark shot up to thirty and stayed at thirty idling very rough, then I reved a couple times more and the timing went back to around 16. Any ideas?

 

mg man

Member

Jun 24, 2006

142

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16

Aug 13, 2006

#2

• Aug 13, 2006

• #2

Maybe wrong again I read in 85 ford manual about the vane in the distributor generate a voltage pulse as they pass the hall effect device in the distributor.This a quote from the manuel."The voltagepulse is used by the EEC-IV system for sensing crankshaft position and computing the desired spark advance based on engine demand and calibration." Do you have a spare distributor to try. Also check ditributor shaft center is not worn. I had a now junk 2.3 turbo that stripped the shaft on 2 distributor.I did not solve that motor. good luck

 

Green_NV

New Member

Dec 12, 2007

7

0

0

New Westminster, BC

Dec 12, 2007

#3

• Dec 12, 2007

• #3

Sorry to dig up an old thread, but did this ever get figured out? My car is doing the exact same thing that was mentioned at http://forums.stangnet.com/showthread.php?t=649560

 

BlownFiveLiter

have car, will race....wait, it doesn't run

15 Year Member

Nov 29, 1999

3,133

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108

Chicagoland

Dec 13, 2007

#4

• Dec 13, 2007

• #4

Sounds normal to me. The EEC-IV electronically advances the ignition. Pulling the SPOUT locks out the EEC control. The reason your timing advances more, the higher you rev is because the 4 cycles of the engine take less time the faster the RPM, so the mixture needs to start igniting during the compression stroke, in order to achieve a complete burn for the power stroke to happen. Basically, if your ignition isn't firing earlier, you're going to lose power, and probably increase HC emissions from an incomplete burn.

 

Stinger

Founding Member

Jul 7, 2001

7,754

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118

Basehor (Kansas City), KS

Dec 16, 2007

#5

• Dec 16, 2007

• #5

It should idle around 28-30 degrees with the spout in, never 16 at idle...are you sure the distributor was tight when you were testing this?

 

1badsho

Active User

May 7, 2007

26

4

3

Jan 12, 2008

#6

• Jan 12, 2008

• #6

Stinger said:

It should idle around 28-30 degrees with the spout in, never 16 at idle...are you sure the distributor was tight when you were testing this?

Click to expand...

hmmmmmmmm

 

1badsho

Active User

May 7, 2007

26

4

3

Jan 12, 2008

#7

• Jan 12, 2008

• #7

1badsho said:

hmmmmmmmm

Click to expand...