Brought to you in part by:

Great deals on auto restoration supplies!

.


JC Whitney clearance center!

  Mustangsandmore Forums
  '79 to '93 -- The Fox Mustang
  Timing

Post New Topic  Post A Reply
profile | register | preferences | faq | search

next newest topic | next oldest topic
Author Topic:   Timing
88armystang
Journeyman

Posts: 4
From: Fort Bragg NC USA
Registered: Sep 2004

posted 09-22-2004 03:44 PM     Click Here to See the Profile for 88armystang   Click Here to Email 88armystang     Edit/Delete Message   Reply w/Quote
Hello I'm new on this but i have a problem with my 88 GT. How do you time it. I would like to know what degree mark it has to be on and if it is in the cicle or pointer. I just really need help please

IP: Logged

ddenton749
unregistered
posted 09-22-2004 09:54 PM           Edit/Delete Message   Reply w/Quote
I found this great book called, "How to Understand, Service and Modify Ford Fuel Injection & Electronic Engine Control" by Charles O. Probst, SAE. It's a great book if you want to learn how this EEC stuff works and how to fix it. Here's what it says about base timing:

To check initial timing:
1. Connect a timing light
2. Disconnect the in-line SPOUT connector near the TFI module
3. Check initial timing using a timing light. It should be within 3 degrees of the base timing value on the VECI decal. If base timing is specified as 10 degrees BTDC, 7 to 13 is ok.
4. If not, adjust the timing of the TFI-IV distributor:
a. loosen distributor mounting bolts.
b. rotate the distributor to correct timing.
c. tighten bolts.

TFI - Thick film Ignition is a module mounted on the distributor.
The SPOUT is a little gray plug in the wiring near the distributor.

I hope this helps.

D

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club

IP: Logged

capri man
Gearhead

Posts: 7221
From: doerun, ga.
Registered: Nov 2000

posted 09-23-2004 06:47 AM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
use the pointer. good luck

------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft.

http://community.prestage.com/Member+Pages/789.aspx

IP: Logged

88armystang
Journeyman

Posts: 4
From: Fort Bragg NC USA
Registered: Sep 2004

posted 09-23-2004 05:59 PM     Click Here to See the Profile for 88armystang   Click Here to Email 88armystang     Edit/Delete Message   Reply w/Quote
I don't have that VECI decal. what should mine be on a 88 GT 5.0 ho. Also what would cause it to have white smoke out the tail pipe. and it does have 150 psi compression. but it also backfires when to much throttle.

IP: Logged

ddenton749
unregistered
posted 09-23-2004 07:44 PM           Edit/Delete Message   Reply w/Quote
Army,

The base timing is only for starting the engine. After it starts the computer takes over and adjusts the timing. If you've never moved the distributor, it's probably ok. (within that +/- 3 degrees)

White smoke could be coolant or it could be transmission fluid. Are you losing antifreeze with no visible leaks?

Climb under and check your modulator valve. Pull the vacuum line off and look for tranny fluid. You may be able to see where the line connects up top and check there. I had to replace mine in my '93 Explorer last year.

Can you tell if the backfire is in the intake or the exhaust? That sounds more like a bad valve, lifter, rocker, etc. DO all the cylinders have 150 psig compression? There isn't one or two that are more than 10% lower than the rest?

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club

IP: Logged

88armystang
Journeyman

Posts: 4
From: Fort Bragg NC USA
Registered: Sep 2004

posted 09-25-2004 10:21 AM     Click Here to See the Profile for 88armystang   Click Here to Email 88armystang     Edit/Delete Message   Reply w/Quote
Yes all cylinders are 150 psi compression. Back fire is intake but only when to much thottle is given or it will bogg down. It is making me mad but i don't know what i should about it.

IP: Logged

ddenton749
unregistered
posted 09-25-2004 05:01 PM           Edit/Delete Message   Reply w/Quote
Army,

Are you sure it's a backfire? It only occurs at high RPM's or under any heavy throttle load? It's not just breaking up at higher rpm's? Does it idle ok?

Start with all the simple things first. Check your cap, rotor, and plug wires for any kind of spark cross-over. Check to make sure you don't have a leaky injector. Check to make sure you don't have any vacuum leaks. You may want to give the EGR system a good once-over too.

If everything else checks out, you may be looking at a sticking lifter.

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club

IP: Logged

88armystang
Journeyman

Posts: 4
From: Fort Bragg NC USA
Registered: Sep 2004

posted 09-25-2004 06:55 PM     Click Here to See the Profile for 88armystang   Click Here to Email 88armystang     Edit/Delete Message   Reply w/Quote
It sounds like a backfire. It is not idleing properly. I already bought 2 new o2 sensors, EGR setup. Brand new cap rotor and plugs. Could the wires cuase the problem. but if so then why is it shooting out white smoke. Should timing be zero or off 10 degrees. Also could the ECU be the problem. and i don't think white smoke is right becuase it doesn't seem to have a leak. of anything. but the backfiring also occurs in gear.

IP: Logged

ddenton749
unregistered
posted 09-25-2004 07:41 PM           Edit/Delete Message   Reply w/Quote
Does this car have a lot of miles?

Does the MIL (Check Engine Light) come on?

Double/triple check your firing order.

What made you change the EGO sensors and the EGR?

Look for vacuum leaks. Is it an auto trans? Check the vacuum modulator valve. White smoke could be A/T fluid or coolant. What kind of odor does the white smoke have? Does it smell like burning oil?

Do you have to add coolant often?

Look for oil in your intake manifold. The idle air control valve (IACV) could be clogged/stuck causing poor idle.

Initial base timing should be around 10 degrees BTDC. Check it with the SPOUT plug out. Timing will vary once the computer takes control of it.

Check for leaky injectors. That is done with a fuel pressure guage connected to the Shrader valve on the fuel rail. Fuel pressure should be around 37 psig and it should hold after the engine is turned off. If it doesn't hold there is a leak somewhere - possibly one or more injectors.

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club

IP: Logged

ddenton749
unregistered
posted 09-25-2004 07:45 PM           Edit/Delete Message   Reply w/Quote
Ponybabe posted a question about lifter R&R on 09-17-2004 in Tool TIme and Ford Racing. Maybe you could ask her what kind of symptoms she had which led her to the failing lifter.

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club

IP: Logged

All times are ET (US)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply
Hop to:

Contact Us | Mustangsandmore Front Page

Copyright 2005, Steve LaRiviere. All Rights Reserved.


Ultimate Bulletin Board 5.47d

Amazon Honor System Click Here to Pay Learn More

[Build a free Mustangsandmore.ws Home Page!]

[Posting Pictures]

[About M&M][Acronyms][Calendar][Chat][Classifieds] [Members' Pics]

[M&M Conventions] [M&M Mug Shots]

[ Mustangsandmore.com Bookstore] [ Smokin' Fords] [Tech Articles]