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post #1 of 25 (permalink) Old 12-27-2011, 01:18 AM Thread Starter
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Check engine light

So I had to replace the fuel pressure reg to fix a hard start issue,prob fixed but now CEl comes on ,why? I did find some cracked vac lines and fixed those,engine runs super smooth,never had an issue with cel on this car till I did the fpr.
any Ideas?
I'm pretty sure its vacuum related since I had to pull the top of intake off to replace fpr, reused gasket but used sealant,,I figure vac leak is making the fuel pressure in system go up and riching the mixture so 02 sensor's picking that up.

Last edited by 1956pack; 12-27-2011 at 03:21 AM.
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post #2 of 25 (permalink) Old 12-27-2011, 10:33 AM
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He's got an EEC IV, Lee*. Lee is right about silicone RTV unless you use the special compound. If upper gaskets still look good, better to just use a petroleum based, very sparingly.

How about being more specific about the CEL. Does it remain on constantly.. or go back off.
My guess.. cuz it happened/happens to me occasionally..It comes on when warmed and at low speed, goes off at highway cruise. If that's the case:

For me, it's always EGR/DPFE Related

* The autoparts stores arent going to read your codes, get a 12 volt test light and go to
http://www.oldfuelinjection.com/?p=13

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post #3 of 25 (permalink) Old 12-27-2011, 10:44 AM
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Don't clear the code, don't guess.

Ge the code read, then you'll know why the computer is complaining and where to look for solutions. For instructions on how to read OBD-I codes without a test light or scanner, see here: http://web.archive.org/web/201011302...index.php?p=13

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post #4 of 25 (permalink) Old 12-27-2011, 12:47 PM Thread Starter
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I used Hylomar® Universal Blue
http://www.hylomarsealant.com/
Love this stuff,racers use it,pricey but worth it,Had to use it on my 300e upper timing cover,only sealant that worked for design flaw oil leak.
cel come on aft 3 min of driving,then stays on.
aft I replaced fpr started it up and idle was high and drifting around,found bad connector pcv line conn under manifold bad and leaking,fixed it and now runs smooth,only thing is cel ,maybe egr is blocked,read that could do it also.
will run test tomorrow ,have a day off.
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post #5 of 25 (permalink) Old 12-27-2011, 01:19 PM
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post #6 of 25 (permalink) Old 12-27-2011, 01:53 PM
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Quote:
Originally Posted by leegrady View Post
Here in Minnesota all the parts stores (Advanced, AutoZone, O'Riley's etc...) will come out to your car, and test for codes free. Had it done many times.
And your car is OBD-II, I bet.

Locally, they don't have a Ford EEC-IV scanner. Or, as it's also known, OBD, OBD-1, or OBD-None

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post #7 of 25 (permalink) Old 12-27-2011, 02:31 PM
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The simple thing to do is get the code. Guesswork wastes time and money. There is no such thing as a "ghost code", the EEC will throw a code if and only if the conditions are met for that error code to be presented. Computers do only what they're told. No more, no less. If a code was recorded, then the circumstances required for such an error were recorded. This can only be caused by a mechanical or electrical fault in the system somewhere and should be investigated.

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post #8 of 25 (permalink) Old 12-27-2011, 02:32 PM
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Paperclip or short piece of wire has always worked for me.

Just short the two pins on the EEC test port, and count the blinks on the dash.

EASY .. no code reader tool necessary, no guessing, just get the answer with a paperclip, I am sure EVERYBODY here can get one.
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post #9 of 25 (permalink) Old 12-27-2011, 02:40 PM Thread Starter
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Think I found the prob.one of the vac lines off the T attached to the firewall ,was laying on the egr tube ,and melted thru! fixed it and will test drive it to work in a little while,will post results,pretty sure that's it.
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post #10 of 25 (permalink) Old 12-27-2011, 02:55 PM
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Originally Posted by leegrady View Post
Yeah, you're right. I just call Advanced Auto Parts, and he said the don't have the connectors anymore for the EEC-IV. Only OBD-II, which yes, my T-Bird LX is Onboard Diagnostics Two. Bone stock car w/ 4.6 liter, and almost ready for paint!
The OP has a 1993 Cougar with a 3.8L - he is OBD-I with an EEC-IV.

Your car is a 1995 Bird LX with a 4.6L - those are OBD-II with an EEC-V (the '95 with a 3.8L is still OBD-I until 1996, however).

We have a big scanner at the shop with a ton of different connectors for OBD-I and OBD-II cars, and it is easy to just read the screen. But when it's not available, it's very easy just to use the jumper and count the blinks as described in my previous post.

OP, glad you got it worked out! Happy New Year!

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post #11 of 25 (permalink) Old 12-27-2011, 03:08 PM
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Quote:
Originally Posted by 1956pack View Post
..,I figure vac leak is making the fuel pressure in system go up and riching the mixture so 02 sensor's picking that up.
Ummm that's not how it works. It's air / fuel but in a vac leak the FPR will not fully compensate, let alone go 'too rich' for the ECM to compensate.

Quote:
Originally Posted by 1956pack View Post
Think I found the prob.one of the vac lines off the T attached to the firewall ,was laying on the egr tube ,and melted thru! fixed it and will test drive it to work in a little while,will post results,pretty sure that's it.
I'm sort of surprised you didnt have cold or warm - idle problems. Why not read the stored code, anyway. Could be educational.
ADDED:
HAH!1 Read up and highlight the blank space to see my guess. read to end to see the real problem explained.

It is an EGR Fault!!

I learn more about cars every day!
I do it just because I still want to know HOW and WHY!!! Quit learning=die. Be informed as to WHAT, rather than learn,=brain-dead already.
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Last edited by pettyfog; 12-28-2011 at 10:02 AM.
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post #12 of 25 (permalink) Old 12-27-2011, 08:36 PM Thread Starter
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Ok that was it ,melted vacuum line,didn't melt all the way thru,just enough so, map sensor wasn't seeing vacuum,causing 02 sensor to light up. it was the red plastic tube melted just enough so you couldn't blow thru it so it wasn't causing vac leak. fixed no cel anymore.thanks everyone for input!
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post #13 of 25 (permalink) Old 12-27-2011, 08:57 PM
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But you will have EGR codes. It is the nature of the 94-95 models with the lovely intake passages.

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post #14 of 25 (permalink) Old 12-27-2011, 10:11 PM
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But you will have EGR codes. It is the nature of the 94-95 models with the lovely intake passages.
The OP has a 3.8L. I believe you are talking about the 4.6L engines.

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post #15 of 25 (permalink) Old 12-27-2011, 10:19 PM
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The OP has a 3.8L. I believe you are talking about the 4.6L engines.
You are correct. Was hard to follow the thread. (old age with alcohol... )

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post #16 of 25 (permalink) Old 12-27-2011, 10:52 PM
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You are correct. Was hard to follow the thread. (old age with alcohol... )
Are you making fun of me?

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post #17 of 25 (permalink) Old 12-27-2011, 11:00 PM
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You are correct. Was hard to follow the thread. (old age with alcohol... )
I thought that was "(old aged alcohol)" ...

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post #18 of 25 (permalink) Old 12-27-2011, 11:24 PM
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Are you making fun of me?
Oops. No I have a few on you...


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I thought that was "(old aged alcohol)" ...

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post #19 of 25 (permalink) Old 12-27-2011, 11:44 PM
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post #20 of 25 (permalink) Old 12-28-2011, 08:46 AM
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It's all good Mr. Ralph and Mr. Brown!

Yeah I get ribbed a bunch from the young un's here all the time.
Oh the jokes about Matlock and drinking Ensure...
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post #21 of 25 (permalink) Old 12-28-2011, 08:55 AM
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Yeah I get ribbed a bunch from the young un's here all the time.
Oh the jokes about Matlock and drinking Ensure...
Or the ever popular:

"Do you wear boxers or briefs?" "Depends."



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post #22 of 25 (permalink) Old 12-28-2011, 09:53 AM
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I'm freakin' 69 years old.. shut it with the OLD JOKES! I was going in the navy when you puppies were starting first grade.. well at least Ralph.

How about back to topic? I annoy the **** out of guys on the Blazerforum by correcting mis information and this topic aint done yet.. cause now I'm fixing some here!
Quote:
Originally Posted by 1956pack View Post
Ok that was it ,melted vacuum line,didn't melt all the way thru,just enough so, map sensor wasn't seeing vacuum,causing 02 sensor to light up. it was the red plastic tube melted just enough so you couldn't blow thru it so it wasn't causing vac leak. fixed no cel anymore.thanks everyone for input!
Ummmm.. No, it wasnt O2 that did anything

The code, if the OP would pull it had nothing to do with any O2 sensor, it would reflect an EGR fault.



If his 93 3.8 is like mine.. There is supposed to be two vac tubes across the firewall to a solenoid activated valve on back of Pass wheelwell
Red from the vac tee to the valve, green from the valve to the EGR diaphragm.

Also there is no MAP on these. It's a BAP. If it had been a line to a MAP, there would have been driveability problems.

Since the EGR actuator never saw vacuum, it remained closed so it ran fine.

I posted in the got for christmas thread that I havent pulled an EECIV code for almost ten years, and it was probably 5 years before that so I understand the OP.

Still people do search for similar problems in these forums and also remember what they read incidently. It WAS EGR not actuating that caused the CEL

I learn more about cars every day!
I do it just because I still want to know HOW and WHY!!! Quit learning=die. Be informed as to WHAT, rather than learn,=brain-dead already.
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Last edited by pettyfog; 12-28-2011 at 10:16 AM.
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post #23 of 25 (permalink) Old 12-28-2011, 03:53 PM
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I'm freakin' 69 years old.. shut it with the OLD JOKES! I was going in the navy when you puppies were starting first grade.. well at least Ralph.

How about back to topic? I annoy the **** out of guys on the Blazerforum by correcting mis information and this topic aint done yet.. cause now I'm fixing some here!

Do you tell the Blazer guys about us Thunderbird guys over here ???

Hey I had a buddy stop by earliar this month with a 1999 GMC Jimmy, code P1345 - Camshaft / Crankshaft correlation. I think it has a stretched timing chain .. any thoughts ?
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post #24 of 25 (permalink) Old 12-28-2011, 06:25 PM
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Do you tell the Blazer guys about us Thunderbird guys over here ???
There's several guys over there whose MUST RUN when needed vehicle is a 'bird.
Yeah.. I tell 'em we got REAL Fuel injection, working at realistic pressures, and if we got a distributor looking thingy, it's a distributor. Not a 'camshaft position sensor'. Which leads us to...
Quote:
Hey I had a buddy stop by earliar this month with a 1999 GMC Jimmy, code P1345 - Camshaft / Crankshaft correlation. I think it has a stretched timing chain .. any thoughts ?
Usually it isnt the timing chain.
Did he recently change the distributor ..ooops..'camshaft position sensor' or the gear on it, or replace lower intake gaskets, or the CKP?
Anything that disturbs the timing relationships between crank and the distributor pickup might cause it. Usually if nothing had been changed, there will be P0300, random misfires first.

Best bet, if he knows the distributor is good, with no gear or shaft bearing slop, is to just take it to a dealer shop.

Takes at least a $500 scan tool -or a TechII- to do CASE relearn, which will fix it if there's no mechanical problems.
__________________________________________________ _________________

Back on original topic.. had to run to Columbus today.. and guess what I got.. a freaking CEL, and almost certainly an EGR code!!!!

I'll read it out tomorrow. What goes around comes around.

I learn more about cars every day!
I do it just because I still want to know HOW and WHY!!! Quit learning=die. Be informed as to WHAT, rather than learn,=brain-dead already.
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post #25 of 25 (permalink) Old 12-28-2011, 11:17 PM
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Usually it isnt the timing chain.
Did he recently change the distributor ..ooops..'camshaft position sensor' or the gear on it, or replace lower intake gaskets, or the CKP?
Anything that disturbs the timing relationships between crank and the distributor pickup might cause it. Usually if nothing had been changed, there will be P0300, random misfires first.

Best bet, if he knows the distributor is good, with no gear or shaft bearing slop, is to just take it to a dealer shop.

Takes at least a $500 scan tool -or a TechII- to do CASE relearn, which will fix it if there's no mechanical problems.
__________________________________________________ _________________

Back on original topic.. had to run to Columbus today.. and guess what I got.. a freaking CEL, and almost certainly an EGR code!!!!

I'll read it out tomorrow. What goes around comes around.
Haha, I figured that. From what I can tell, it looks like the Previous owner pulled the intake manifold for some reason - telltale RTV. Told the new owner all he needed was a new sensor - and of course he replaced both with no changes at all.

Distributor only goes in one way, no slop .. so yeah a re-learn sounds likely, but I dont get these GM's as often as anything else.

Good old Check engine light. Its a great way to earn money when its not your car, or a headache when it is ...
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