My weekday commute is 40 miles and has been automotively uneventful. On the weekends however, I drive 7 miles; shop for a couple of hours and the car won't start. It cranks but it won't turn over. I have electrical power, so it's not the battery. After sitting about 30 minutes it will start normally. This has happened about 12 times in the last 5 months. Lately, and only sometimes, it stalls while idling at red lights, but will start right back up. I've left it overnight with Saturn diagnostic technicians & other mechanics. They all say it has to happen to them to figure it out, but it always starts for them. Could it be the timing belt?
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Has the exhaust ( catalytic converter) been check for proper flow? I would try a test pipe to by-pass converter and see if that helps. You used to be able to buy them, but a good exhaust shop can make one pretty quick, and then try it.
Hey there. Tom here. I am a automotive shop owner in south Ga. we have a similar vehicle same symptoms. After many hours of testing, found faulty totlaly integrated power module. fuel pump relay was not being energized at times. this relay and controls are integral to tipm. Our fix was to replace tipm.
Other damage is not likely right IF you are not getting a front end woble. Many people drive around with worn shocks or struts everyday. The key is to know when it is too long. The idea and design of these dampners is to not absorb bumps but to return the wheel to the road in a quick manner. If they are worn out then the wheel does not return all that quickly and can allow the wheel to bounce like a basketball. If it is not bouncing, take your trip and get it done this weekend.
Sounds like it could be your alternator (the part which recharges your battery while you're driving.) If it's in the process of dying, it will still give a little power back, and it will seem to be doing it's job when you're in the shop, but after some driving, you'll lose power. If it isn't that, there's also a chance it could be you have a short somewhere which is draining your battery.
I would get your alternator checked first.
I hope that helps.
Caid.
Sounds like it is running lean because of fuel not getting through or air getting in. Taking foot off pedal means the air fuel ratio changes and the engine can run ok at low revs. Has the hot wire on the fi been checked. The last time this happened to me was in a alfa when the crud in the tank blocked the final fuel filter into the carb. The fuel system has several filters so check them all.
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