my 96 T100 which total 300K miles has been a faithful reliable truck to me for the past 17 years. It has recently developed a air/fuel mixture problem that gradually made the truck non drive able. The local Toyota dealer in Lakeland FL diagnosed vacuum leaks. I did replace all the hoses (big n small) without any improvement, I then replaced the fuel pump (the original one), the fuel filter, the fuel pressure valve ....without any luck. the check engine light was still on. I then sent the truck to my local mechanic (trusted one) . I got the call this AM telling me that the computer is inoperable, and was informed that due to the age of the truck, was no longer available (at least the five places the mechanic has contacted) . has anyone experienced the same problem? any solutions? I don t want to trash the truck, it has been so good so far I was hoping another 10 years/200K miles before retiring it. any input would be greatly appreciated. thanks
gel69
Specs on yer T-100? Auto or manual transmission? 2WD or 4WD. 4 or 6 cylinder engine? 
What was the actual code that was pulled from the ECU?
There are a few option fer you. There are shops that will "repair" yer ECU fer you fer about $400. Not sure if they can do an operational test or not but highly unlikely.
You can give www.car-part.com a visit and see which yards may have a used ECU that matches yer T-100. Most will ship and offer some sort of warranty or guarantee.
What was the actual code that was pulled from the ECU?
There are a few option fer you. There are shops that will "repair" yer ECU fer you fer about $400. Not sure if they can do an operational test or not but highly unlikely.
You can give www.car-part.com a visit and see which yards may have a used ECU that matches yer T-100. Most will ship and offer some sort of warranty or guarantee.
Specs on yer T-100? Auto or manual transmission? 2WD or 4WD. 4 or 6 cylinder engine?
What was the actual code that was pulled from the ECU?
There are a few option fer you. There are shops that will "repair" yer ECU fer you fer about $400. Not sure if they can do an operational test or not but highly unlikely.
You can give www.car-part.com a visit and see which yards may have a used ECU that matches yer T-100. Most will ship and offer some sort of warranty or guarantee.
my T is a 2WD automatic transmission 6 cyl 3.4 liters
I don t have the code yet but am suppose to meet my mechanic at his shop tomorrow AM to discuss options
Since the CEL is on is the ecm showing ANY codes? Try a used one from Car-part.com. They don't weigh anything so alot of junk yards will ship it. I don't know which T100 you have but saw used ECM's going for any-where from $40 and up! Also I noticed several ECM repair /exchange ECM companies in Florida which would keep your turn-around time down. From $159 and ? These guys might be a good source for info if nothing else. https://moduleexperts.com
Or a unit with a warranty from https://www.ebay.com/sch/Car-Truck-...0GAS%20DOHC%20Naturally%20Aspirated~DLX~3.4L&_nkw=ecm 1996 Toyota T100 DLX 3.4L
Or a unit with a warranty from https://www.ebay.com/sch/Car-Truck-...0GAS%20DOHC%20Naturally%20Aspirated~DLX~3.4L&_nkw=ecm 1996 Toyota T100 DLX 3.4L
I'll be curious on how the mechanic came to the conclusion that the ECU is dead. The code that was pulled prior to the ECU being diagnosed as dead is gonna be key to the area to look at.
Common issues with this truck are usually grounding problems as the truck ages. Clean all grounding points prior to replacing parts.
As stated before, the fuel air mixture is problematic. Since the injectors are ground based switching, the brown ground wires on the air plenum near the Diagnostic connector are the key fer the injectors. Any corrosion will increase the resistance and give a weak signal to the injectors which could cause intermittant fuel delivery. Was the fuel pressure measured?
Has the MAF been inspected and cleaned? After cleaning the MAF, the ECU will need to be reset by pulling the EFI fuse fer about 2-3 minutes.
Has a vacuum leak test been performed? What method was used? Propane, smoke, or starter fluid? Exactly which hoses were replaced? How bad of a condition were the replaced hoses?
When was the last time a tune up was performed on the truck? What brand of parts were used to replaced the worn parts? How good are those spark plug wires? Was any maintenance performed prior to the fuel/air mixture issue?
Common issues with this truck are usually grounding problems as the truck ages. Clean all grounding points prior to replacing parts.
As stated before, the fuel air mixture is problematic. Since the injectors are ground based switching, the brown ground wires on the air plenum near the Diagnostic connector are the key fer the injectors. Any corrosion will increase the resistance and give a weak signal to the injectors which could cause intermittant fuel delivery. Was the fuel pressure measured?
Has the MAF been inspected and cleaned? After cleaning the MAF, the ECU will need to be reset by pulling the EFI fuse fer about 2-3 minutes.
Has a vacuum leak test been performed? What method was used? Propane, smoke, or starter fluid? Exactly which hoses were replaced? How bad of a condition were the replaced hoses?
When was the last time a tune up was performed on the truck? What brand of parts were used to replaced the worn parts? How good are those spark plug wires? Was any maintenance performed prior to the fuel/air mixture issue?
Was any other component removed/replaced/adjusted? Usually a higher RPM is a sign of a vacuum leak or a stuck IAC valve.
An inspection of yer IAC valve is important to see if it is sticking open or not. It will usually git built up with carbon over time.
I fergot to ask, is the Check Engine light on? If so, what were the exact codes that were recorded?
I fergot to ask, is the Check Engine light on? If so, what were the exact codes that were recorded?
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