My car is a 98' Toyota Cellica GT Convertable. Over the years occasionally my car will idle low and shut off reguardless of the weather. I have taken it to my mechanic (who has been working on our family cars for 20 years so it is not a case of a bad mechanic) however when I brought it in he was never able to find the problem. I have had the idol intake valve changed and the pcv valve changed out. My car is always up to date on scheduled maintenance. In the past few weeks I have had to give my car a little gas (with out reving the engine) until it is warm then it runs fine however this is EVERY time I start my car now. Once the car is warm it runs like new, and I have no problems when I have to stop and sit idle. I recently had a full diagnostic done on the car at 3 different shops and my car has come back with a fully clean record. Does anyone know what may cause this? A sensor maybe? What do I need to do to get my car working properly. Your help is greatly apreciated.
2007-03-15 08:50:50 · 7 answers · asked by shadowsthathunt 6 in Cars & Transportation ➔ Maintenance & Repairs
MAF sensor could be dirty
Oxygen sensor, but then a dig should catch these unless the Mass air flow is just real dirty.
Throttle position sensor, has it been replaced, not too costly. it may be worn and not picking up properly.
2007-03-15 09:06:25 · answer #1 · answered by Uncle Red 6 · 0⤊ 0⤋
Check two things...since your car is now nearly 10 years old, the throttle body passages are probably pretty gunked up. A spray can of throttle body cleaner would probably help. Additionally, deposits on top of the intake valves can create this problem, a good quality fuel system cleaner would improve things.
Lastly, and most likely, carbon buildup around the EGR pintle may be preventing the EGR from completely closing, or buildup around the shaft may be causing the valve to stick. A good cleaning (remember to replace the EGR gasket with a NEW one), may solve your problem.
2007-03-15 09:06:41 · answer #2 · answered by Galaxie500XL 5 · 1⤊ 0⤋
I'm willing to bet that when you take your car to the shop it is already warmed up and therefore makes it difficult for the mechanic to diagnose the problem. You should leave the car with them overnight so that they can experience the problem you are having when starting it from cold.
It sounds like the cold fuel enrichment valve is not functioning properly.
2007-03-15 09:30:28 · answer #3 · answered by Gordon B 4 · 2⤊ 0⤋
The coolant temp sensor for the ECM may be faulty and affecting the air/fuel mixture. Have the sensor tested (may need to test while it is actually failing, a hard thing with intermitent issues)
2007-03-15 09:59:57 · answer #4 · answered by fwendt72 3 · 0⤊ 0⤋
It could be something as simple as a vacuum line that's disconnected or has a leak in it somewhere. I say "simple" but sometimes it can be hard to find. But if that's what it is, that's a cheap fix!
2007-03-15 12:46:51 · answer #5 · answered by sd bass 2 · 0⤊ 0⤋
Check for a faulty oxygen sensor, and your vacuum lines.
2007-03-15 08:55:57 · answer #6 · answered by Anonymous · 0⤊ 0⤋
spray the moving parts of the intake body(mass sensor area and accelerator linkage) with white lithium grease.
2007-03-15 08:58:15 · answer #7 · answered by Anonymous · 0⤊ 2⤋