1995 Aerostar with a 4.0L won't go into overdrive.

[jordan101]

my father has the 95 4.0 and his isnt shifting into overdrive. We recently had the tranny fluid changed and the mechanic couldnt see any metal shavings or really nothing wrong inside the tranny. I beleive i checked the right fuse which is number 17 or 18 in fuse box they were good unless it has a relay under the hood.

 

[BrooklynBay]

Does it have a check engine light with codes? Check the overdrive solenoid, internal wiring harness, TPS, ECT sensor, and the MAF sensor.

 

[jordan101]

No engine codes. I know the maf is like 2 years old but i can clean it. Is the tps the throttle position sensor? And whats the ect sensor?

 

[jordan101]

Ok it is running rich so i think it is either the ect or tps sensor but where is the tps sensor located at? I own an explorer so i have no clue where these sensors are even located at.

 

[BrooklynBay]

The TPS is the throttle position sensor. It's on the side of the throttle body, and has two phillips screws holding it. These screws are usually hard to remove. Ford should have used hex head bolts. The ECT is the engine coolant temperature sensor. It could cause a rich condition if it's out of spec. You could check the TPS & ECT with an Ohmmeter.

 

[jordan101]

Wouldnt a code go off if either sensor is bad.

 

[BrooklynBay]

Not unless it's way out of spec or dead.

 

[wood1]

Not necessarily.

 

[wood1]

Ha! You beat me to the punch BB.

Cheers,
Wood.

 

[BrooklynBay]

You should check for stored codes even if there is no check engine light.

 

[jordan101]

do either of you guys know the specs or where i can find i dont have a manual or anything.

 

[BrooklynBay]

I have the specs for the ECT in # 25 in my list of useful threads.

 

[jordan101]

I never thought of that all i got is an obd2 code reader i think ill take it to oreily auto parts and see if they can code read it.

 

[BrooklynBay]

You could read the codes if you jump the EEC-IV connector with a wire or a paper clip, and check the flashing check engine light.

 

[jordan101]

o man thats old school i remember the 89 honda prelude i had it was an obd0 so it had 17 codes and when the check engine light came on all i had to do was count the flashes of the led light on the pcm.

 

[BrooklynBay]

You could get an inexpensive code reader, but you will have to refer to the list of EEC-IV code definitions. This worked for me. Amazon sells them pretty cheap.

 

[jordan101]

ya i got mine there for 25 dollars and its pretty good.

 

[BrooklynBay]

I have a product review on the code reader: http://www.explorerforum.com/reviewpost/showproduct.php/product/438/cat/all

 

[mdave1956]

I had the same problem my 1995 awd ran good parked it for the night the next day on O/D I found the problem after doing all the testing. I took off the oil pan on the transmission and found a broke O/D band so I took out the trans. replaced the band checked all the other parts and it even shifted better then before the loc. transmission shop told me alot of the transmissions like mind had the same trouble they helped me anytime I had a ?

 

[FORDBOYpete]

1995 should be OBD-1. You can read them using a good analog VOM & data link to get them, then check codes on line for your specific vehicle. In fact isn't there a sticky on here somewhere about reading FoMoCo OBD-1 data ?

Also be sure internal solenoids & connections in A4LD, in fact all Bordeaux C3 variants function. Many a $'s are been spent on unneccessary O'Hauls when it's more faulty/ inaccurate diagnosis of errant internal solenoid or worse bad internal or external wiring!

FBp