Hello,

I have bought a 1989 4wd extended cab with the 3.0l V-6, I've had the valves adjusted,new Vacuum Lines,new TPS, new ECTs,new Fuel filter, Air Filter, Intake Tube (bellows) and Sparkplugs/wires. Now my problem is still the same as when I bought it just not as bad. In the morning the engine doesn't want to start. After work or anytime that the air is about 70 or above it starts right up. Also, it loses power when the engine is switching over to ECM control, about 1 mile from where it starts. After the engine has reached running temperature no problems exist except one it is a gasoholic and get about 10 mpg, Oh that hurts!

Any help would be Greatly Appreciated, Thanks,

Matt

 

Yet another "replace parts til it works" lol.

You need to TEST the parts before replacing them willy nilly.

Sounds to me like your cold start injector switch is bad. Same exact problem on my 85 MR2. Test that switch (located at the back of the engine, in the coolant sensor block) and go from there.

 

Thanks for your Idea, only one problem. I can't find any specs on the switch, I found out it is still a thermistor and I would need the cold resistance and hot resistance to know if mine is good. According to my local Toyota dealer mechanic they don't have a test, but they will sell you one for $180.

 

INSPECTION OF START INJECTOR TIME SWITCH
MEASURE RESISTANCE OF START INJECTOR TIME SWITCH
(a) Disconnect the connector.
(b) Using an ohmmeter, measure the resistance between terminals.

Between terminals Resistance (ohms) Coolant temperature
STA - STJ 30-50 Below 50 deg. F
70-90 Above 77 deg. F

STA - Ground 30-90

When you look at the teminals with the connector "latch" to the bottom, STA is on the left.

 

I found a switch off of a Runner that looked similar and measured its resistance and it's within your specs. I'll see in the morning how it works, thanks.