1988 GT with 3sfe. Just a bit of a high idle in Park and Neutral - 1400 RPM go into gear and she sits right at 750RPM. I adjusted the timing and idle per the book but still have the high idle. Next symptom is if the ambient air temp is over 75 degrees Fahrenheit and I drive roughly 100 miles without turning off the car the car starts to have a soft miss with a Check engine light that comes on with each miss. After the miss starts it gets worse to the point I have to pull over. If I shut off the car for 5 minutes, it starts and runs fine for the next 100 miles or so. The check engine code is for Lean. And just recently when I start the car cold it takes two starts to get her to fire up. ( I suspect the thermo timer has gone bad ) Here´s what I´ve done so far. New plugs, wires, dizzy cap and rotor. New MAF ( or whatever Toyo called it that year ) new temp sensor for the EFI. New Denso O2 sensor. Each of the changes has made for more power and pickup so cheers to that, but I´d like to take the car for a long trip so I need to fix this. I find it very strange that this issue only happens above a certain temperature.... Any thoughts?
So it turned out to be the Fuel Filter. Thanks Mafix for steering me in the right direction! This was replaced 1 year ago, so probably time to clean the fuel tank. Thought I´d try the easy thing first (which almost never works out) and figured I´d have to change the filter if I replaced the fuel pump anyway, once I pulled the filter and I saw the sludge that was in there and the fact that I couldn´t even blow through the filter I knew that was the issue. Thanks again. :hurray Newcastle Brown Ale work as payment? :cheers2
