1988 Mazda 929 Fuel system Problems

“When I start the car in the morning it idles about 2000 RPM then drops to 1000 RPM and revs back up to 1800 RPM and continues pulsate in neutral every second until you put it in drive. In drive it remains idling at 1500 RPM until you shut it off and restart. If the engine is not warm enough it starts over doing the same thing otherwise it begins to idle correctly. With the idle high it makes it very hard to stop the car. What can be done?”

“This failure only happens below 20deg f. Problem goes away when engine warm. On very cold startup, fuel drips rapidly and visibly from bottom of pressure regulator to valve cover. See odi id's 380248, 437128, 416832, 825336, 946072, 956814, 979475. Turkey dealers let car warm in garage before attempting to locate problem. Problem only occurs when part and/or fuel is uncomfortably cold. My dealer said you have a gas leak when I drove in. 2 hours later they charged $25 and said there was no gas leak, even though I pointed to the part which drips.”

“Consumer experienced fuel vapor smell coming into the vehicle while driving. Vehicle has been in and out of the dealer shop three times before correction was made, but all cost was to the consumer. The fuel injection system was replaced, consumer believes that the only repairs needed were the replacement of an old/cracked rubber tubing and to retighten the intake manifold bolts or the head bolts. …”