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TFI-IV problem on 302 EFI ???
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vince XXX
• Recklinghausen, XX, Germany
• Registered on 6/7/2003
• 2 posts
2 Vehicles
Posted:6/8/2003 04:20
hi there.

these problems occur on my 1988 lincoln town car with 302 EFI:

first i had rough idle, i changed the EGR, i changed the idle air bypass valve, sparks and cables are new, distributor cap and rotor are new, then i found out, that my upper intake manifold had a crack at the backside (so it could breathe false air only at the last cylinder), i mounted a new (used) upper intake manifold from another town car of the same year.

afterwards i set the timing with a light (did it all like it says in this pretty good site about motorcodes and stuff: http://www.dalidesign.com/hbook/eectest.html#TIMING )

my fan cover decal tells me i have to set the timing to 10 BTDC. i did so. and in the page it tells me that WITH spout again plugged in, it should be advanced about 20 degrees MORE, so the advance should be around 30 degrees. but on my car it�s around 20 degrees!!!

SHOULD THAT INDICATE, THAT MY TFI-IV-MODULE IS BROKEN??? i read an article that the used modules in all type of EFI-engines "have an inordinately high propensity for failure due to overheating". (read the whole article here: http://www.tfisettlement.com/notice.html )

the enine sometimes backfires (it made my aftermarket-air-filter explode!), it seems to be very hot, but stays in "normal" temparature areas. the temp sending unit is new and i will mount a new thermostat also the next days. also the engine sometimes when in normal operating temp (like after a 20mile drive), while waiting at traffic lights shuts off and isnt�t able to get started again. but after unplugging the SPOUT-connector it starts!!!

DOES ANYONE HAVE A CLUE?
edited 6/8/2003 04:39
BigSwede
• Sarna, XX, Sweden
• Registered on 8/17/2002
• 36 posts
1 Vehicle
Posted:6/9/2003 19:08
Just a question:
Did you unconnect the battery to reset the memory of the EFI?
I have read that you always should do that after beeing operating on the engine.
Lift off the negative connection for a couple of minutes and then put it back, and then drive around for 20-30 Kilometers so that the memory will adapt to the settings of the engine.
Otherwise the EFI will run with old settings...

Can someone confirm this or have I got it from an unreliable source??

Bronco XLT -89
Stock 302cui EFI, K&N
AOD
2" Body lift (not been aplied yet) in the garage...
1300+ watts stereo
JVC MP3 cd
3 amps:1x 2x100w, 1x 2x200w, 1x 2x400w
8 speakers: 2x 6,5" lanzar, 2x 7x10" DLS, 2x 6x9" DLS, 2x 10" Lanzar

New pics!!
John Barrett
• West Palm Beach, FL, USA
• Registered on 1/31/2003
• 106 posts
1 Vehicle
Posted:6/10/2003 20:24
Quote:
hi there.

these problems occur on my 1988 lincoln town car with 302 EFI:

first i had rough idle, i changed the EGR, i changed the idle air bypass valve, sparks and cables are new, distributor cap and rotor are new, then i found out, that my upper intake manifold had a crack at the backside (so it could breathe false air only at the last cylinder), i mounted a new (used) upper intake manifold from another town car of the same year.

afterwards i set the timing with a light (did it all like it says in this pretty good site about motorcodes and stuff: http://www.dalidesign.com/hbook/eectest.html#TIMING )

my fan cover decal tells me i have to set the timing to 10 BTDC. i did so. and in the page it tells me that WITH spout again plugged in, it should be advanced about 20 degrees MORE, so the advance should be around 30 degrees. but on my car it�s around 20 degrees!!!

SHOULD THAT INDICATE, THAT MY TFI-IV-MODULE IS BROKEN??? i read an article that the used modules in all type of EFI-engines "have an inordinately high propensity for failure due to overheating". (read the whole article here: http://www.tfisettlement.com/notice.html )

the enine sometimes backfires (it made my aftermarket-air-filter explode!), it seems to be very hot, but stays in "normal" temparature areas. the temp sending unit is new and i will mount a new thermostat also the next days. also the engine sometimes when in normal operating temp (like after a 20mile drive), while waiting at traffic lights shuts off and isnt�t able to get started again. but after unplugging the SPOUT-connector it starts!!!

DOES ANYONE HAVE A CLUE?


Did you check your O2 Sensors, sometimes they go bad, feed to much fuel, explains why your getting backfire, you may have a vacuum line leaking as well and the timing sounds off, also make sure you got the spark plug wires in the right order for the 302 you have - there are two differant ones (one is for a 302 and the other is for 302HO/351w).

Remember when one Sensor go's bad, it will affect others (meaning you will get codes from the computer for more then one sensor.

What I found to be of big help is to take it to a Good Mechanic, have them put it on there machine and find out what the problem is (no if and or buts), should get a print out of everything that is wrong, there is one thing here - it will cost anywhere from $50.00 to $150.00 for this service, now you can just go and buy the parts and replace them.

or you can purchase a multi-meter and check each sensor yourself to find the ones that are bad then replace them.

John Barrett
• West Palm Beach, FL, USA
• Registered on 1/31/2003
• 106 posts
1 Vehicle
Posted:6/10/2003 20:49
Quote:
Just a question:
Did you unconnect the battery to reset the memory of the EFI?
I have read that you always should do that after beeing operating on the engine.
Lift off the negative connection for a couple of minutes and then put it back, and then drive around for 20-30 Kilometers so that the memory will adapt to the settings of the engine.
Otherwise the EFI will run with old settings...

Can someone confirm this or have I got it from an unreliable source??


Yes this is true.

Now as far as 20 = 30 Kilometers do not now about this.

I have driven 2 - 5 miles and that worked fine.

Now if them codes from the computer still come back, you did not solve the problem, so it sometimes is cheaper to take it and get a printed sheet from a good mechanic that will tell you exactly what is wrong, then go from there if you are going to do it yourself.

(Example)
Was laughing at a mechanic one day - he replaced every sensor in this car (About $400.00 later) and then hooking it up to a diagnostic machine and found out that one of the plastic hoses was leaking vacuum, had two wires on wrong - causing it to over heat still and burned up another O2 sensor...etc.

John Barrett
• West Palm Beach, FL, USA
• Registered on 1/31/2003
• 106 posts
1 Vehicle
Posted:6/10/2003 20:52
Quote:
hi there.

these problems occur on my 1988 lincoln town car with 302 EFI:

first i had rough idle, i changed the EGR, i changed the idle air bypass valve, sparks and cables are new, distributor cap and rotor are new, then i found out, that my upper intake manifold had a crack at the backside (so it could breathe false air only at the last cylinder), i mounted a new (used) upper intake manifold from another town car of the same year.

afterwards i set the timing with a light (did it all like it says in this pretty good site about motorcodes and stuff: http://www.dalidesign.com/hbook/eectest.html#TIMING )

my fan cover decal tells me i have to set the timing to 10 BTDC. i did so. and in the page it tells me that WITH spout again plugged in, it should be advanced about 20 degrees MORE, so the advance should be around 30 degrees. but on my car it�s around 20 degrees!!!

SHOULD THAT INDICATE, THAT MY TFI-IV-MODULE IS BROKEN??? i read an article that the used modules in all type of EFI-engines "have an inordinately high propensity for failure due to overheating". (read the whole article here: http://www.tfisettlement.com/notice.html )

the enine sometimes backfires (it made my aftermarket-air-filter explode!), it seems to be very hot, but stays in "normal" temparature areas. the temp sending unit is new and i will mount a new thermostat also the next days. also the engine sometimes when in normal operating temp (like after a 20mile drive), while waiting at traffic lights shuts off and isnt�t able to get started again. but after unplugging the SPOUT-connector it starts!!!

DOES ANYONE HAVE A CLUE?


Also forgot one other thing, did you check your fuel pressure, must be about 40 - 60 psi for fuel injected and 7 psi only carberated.
vince XXX
• Recklinghausen, XX, Germany
• Registered on 6/7/2003
• 2 posts
2 Vehicles
Posted:6/12/2003 14:17
first, thanks to everyone who tried to help out!

@big swede: hi to up there, but i did disconnect the battery, sorry...

@john: the o2-sensors should be okay, since the motorcodes don�t show a fault on them. when i changed the upper intake manifold, i also changed almost every hose in the engine compartment to just sort out that it was a leaking one. yes i know that there�s a HO-machine which has an other firing order, but i got the non-HO-machine where it�s 1-5-4-2-6-3-7-8...
to take it to a "good mechanic" is not practicable over here (in germany) because normal mechanics (wether good or not) wrench on what you call "sport compact"-vehicles (volkswagen and the whole shit car collection we got over here... i hate them!)
well, i didn�t check fuel pressure, but i�m having an extra fluid-gas-carburetor installed (background: normal gas price is high, fluid gas is less than half), when in use he disconnects the electricity from the injectors and just carburets the fluid gas into the intake manifold through the air filter (it�s quite simple but might be very unuseful for americans cause you got a lot cheaper fuel), so the problems are the same when i�m driving on fluid-gas so it can�t be the injecotors or the fuel pump or something in the gas line circle etc...

next step i do is to read the motorcodes again... i�ll get back with the results.
Forums > SuperMotors Community Discussion > Engine and Drivetrain
TFI-IV problem on 302 EFI ???
Thread Statistics:     Users to Post: 3   |   Total Posts: 6   |   Total Views: 1568
You must be logged in to post in or subscribe to this thread.Pages: 1

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