In many cars a failed mass air flow sensor can cause a car not to start. Search for HPFP problems in BMW 335i or 135i and you will find plenty. When it's failing, first a car lacks power and needs to be cranked longer before the engine starts, then it dies completely. The high-pressure fuel pump is installed on the engine and is a part of direct fuel injection. If the fuel pump doesn't run, your mechanic might have to check the electrical circuit, including the connector and the fuel pump relay.Ī high-pressure fuel pump (HPFP) is another culprit for no-start and long crank problems. It's not difficult to find out if the car doesn't start because no fuel comes from the injectors. When you take your vehicle to the repair shop, your mechanic will need to run a few tests. We strongly recommend that you trust any fuel-related problems to a qualified technician due to fire hazard, as in most cars the fuel pump is installed inside the gas tank. One day, a fuel pump just stops working and the engine cranks, but doesn't start with no fuel supply. Replacing the relay or module is not as expensive as some other problems.įuel pumps are also known to fail. For example, we found this great video explaining the issue. It's a fairly common situation when water or corrosion can cause the module not to work. In some GM trucks, the fuel pump control module (FPCM) is installed underneath, near the spare tire. In some Ford F-150 vehicles, an overheated fuse F27 in the battery junction box (BJB) can cause the vehicle not to start. While researching, we found many complaints related to the Totally Integrated Power Module (TIPM) and not only about starting. In some Chrysler, Dodge, Jeep cars, the corrosion at the relay/fuse box (TIPM module) is another problem that can cause a no start. A bad FPDM module in some Ford vehicles could cause the same problem. In some Chrysler and Dodge vehicles, a bad ASD relay was often responsible for a no-start. In many Honda cars, a failed PGM FI Main Relay could cause a car not to start. The fuel pump relay or fuse or main relay (module) failures are common in some vehicles. Watch these YouTube videos to learn more.īad fuse, main relay, fuel pump or other relay With a fully-charged battery and clean spark plugs, the flooded engine should start if there are no other problems. Once spark plugs are removed, the excess gasoline dries out. Your mechanic may advise replacing or at least removing and drying out the spark plugs and if the battery is weak, re-charging the battery. What happens is the excess gasoline fouls spark plugs and washes off oil from the piston rings, lowering the compression. In some cases it might re-start when pressing the gas pedal lightly while starting. The car starts then stalls out and doesn't re-start again. This problem is common, especially in high-mileage vehicles. Now, Google "Passlock" and you will find a number of threads at various forums describing the problem and ways to fix it. click 'Vehicle Owners' then 'Search Complaints'.Ĭ - search for common complaints.įor example, if you search NHTSA complaints at for the 2002 Chevrolet Impala, selecting "Electrical System" you will find a number of no-start complaints related to the "Passlock" feature. There are websites where you can search for common problems reported by other owners:
If your car won't start, there is a good chance that someone already had a similar problem with the same-model vehicle and already found the solution. Research common problems with your make, year and model First, check for common problems with cars like yours. If your engine cranks normally, but won't fire up, you know that at least your battery is in good shape and the starter motor works. If your car has a push button start system, read this guide: Why a car won't start when you push the Start button?. If your engine won't crank at all, or cranks very slow, or the security light stays on, check the first part: Why a car won't start troubleshooting tips. In this guide, we are going to look into no-start problems when the engine turns over (cranks), but won't start.
#JET MASS AIR FLOW SENSOR PROBLEMS HOW TO#