What are the symptoms of a bad fuel pump in a Toyota 4Runner?
Also, the symptoms are almost exactly the same as bad/clogged fuel filter. Here are the most common symptoms of a bad fuel pump in your Toyota 4Runner: One of the most common signs that a fuel pump is going bad is a whining sound. The whining sound can indicate that the fuel pump is going out before there are any performance based issues.
What causes a Toyota 4Runner to have a lean idle?
If the engine smooths out and HC drops and remains stable, the problem is a lean idle condition. Check for dirty injectors, low fuel pressure or a defective fuel pressure regulator. If HC still fluctuates, however, the engine is still too lean in one or more cylinders indicating a vacuum leak.
How do you find a misfire code on a Toyota 4Runner?
If a misfire is occurring in only one or two cylinders, you will usually find a misfire code for that specific cylinder rather than a random misfire code. Start by checking engine intake vacuum. Connect a vacuum gauge to a vacuum port on the intake manifold. Start the engine and note the vacuum reading.
What to look for in a Toyota 4Runner?
Check for dirty injectors, low fuel pressure or a defective fuel pressure regulator. If HC still fluctuates, however, the engine is still too lean in one or more cylinders indicating a vacuum leak.
What causes a Toyota 4Runner to not start?
Often it’ll be bad spark plugs, or a bad coil pack. If the fuel pump has completely failed, the engine won’t start at all. At the most basic of levels your Toyota 4Runner needs three things to start: Air, fuel, and spark . If any of these things aren’t present, the engine won’t turn over at all.
What to do if your fuel pump doesn’t work?
Thought it was a bad pump so dropped the tank and replaced it..still didn’t work so checked for power at the connector under the rear seat.. nothing.. Swapped out the EFI relay and EFI fuse with working ones still nothing. Jumped the e1 and t terminals in the diagnosis box to check for check engine codes and its showing normal, no problems.
What does a bad fuel pump sound like?
A priming fuel pump sounds like a high-pitched whine for a few seconds and can be heard with a sharp engine right after the ignition key is turned, but before the starter is engaged. The symptoms of a bad fuel pump match a lot of other common problems that can occur in the Toyota 4Runner.