Well, for the past month and a half I've been dealing with an acceleration issue. Under hard acceleration, such as driving on the highway, going up hills, or towing, I'd noticed that the truck really struggles and hesitates. It's really noticeable on the highway when accelerating up hills. It feels like someone is tapping the brakes. Really annoying.
The first thing we did was to clean the MAF sensor, replace spark plugs, and replaced the air filter. It still did it. So we replaced the MAF sensor last week.
It still did it. So it's obviously not the MAF sensor. Luckily they will take back the MAF sensor and give me a credit towards the real issue. My mechanic put his computer in the truck and went for a good drive. He got the truck up to about 3500 rpm. Once he hit there, the fuel pump pressure dropped to 0. Once he took his foot off the accelerator, the fuel pressure came back. So the fuel pump is buggered. He dropped the tank. The filter sock was black with crud and this weird clay/sand stuff on it that rubs off. He said he had never seen a fuel pump/filter act or look like this. He checked the fuel tank out and it is spotless. Fuel is clean and no gunk on the bottom of the tank. So no idea where this stuff came from. I do travel on logging roads quite a bit to go to lakes to do some fishing. So maybe dust from the roads got in the tank? Apparently the fuel pump in the tank comes on every night to check for leaks and my FJ had no codes pending for a fuel system leak. So he has no explaination as to how it got in the tank.
So he is going to replace the whole assembly, as he's not comfortable putting any of it back in. Either am I. Up here in Canada it's quite an expensive part. I was quoted $700 for the assembly. Luckily I get back the $325 I already paid for the MAF sensor. He's going to send a write up to Toyota Canada so they have it on file. He also took the other techs at Toyota for a drive to show them the symptoms so that if they ever have another truck come in displaying the same symptoms, they know what to look for.
Just thought I'd share what was dicovered while troubleshooting the 2 codes my truck spat out. By the way, I have a 2007 FJ with 155,000 kilometers or 96,000 miles.
Cheers,
FF
The first thing we did was to clean the MAF sensor, replace spark plugs, and replaced the air filter. It still did it. So we replaced the MAF sensor last week.
It still did it. So it's obviously not the MAF sensor. Luckily they will take back the MAF sensor and give me a credit towards the real issue. My mechanic put his computer in the truck and went for a good drive. He got the truck up to about 3500 rpm. Once he hit there, the fuel pump pressure dropped to 0. Once he took his foot off the accelerator, the fuel pressure came back. So the fuel pump is buggered. He dropped the tank. The filter sock was black with crud and this weird clay/sand stuff on it that rubs off. He said he had never seen a fuel pump/filter act or look like this. He checked the fuel tank out and it is spotless. Fuel is clean and no gunk on the bottom of the tank. So no idea where this stuff came from. I do travel on logging roads quite a bit to go to lakes to do some fishing. So maybe dust from the roads got in the tank? Apparently the fuel pump in the tank comes on every night to check for leaks and my FJ had no codes pending for a fuel system leak. So he has no explaination as to how it got in the tank.
So he is going to replace the whole assembly, as he's not comfortable putting any of it back in. Either am I. Up here in Canada it's quite an expensive part. I was quoted $700 for the assembly. Luckily I get back the $325 I already paid for the MAF sensor. He's going to send a write up to Toyota Canada so they have it on file. He also took the other techs at Toyota for a drive to show them the symptoms so that if they ever have another truck come in displaying the same symptoms, they know what to look for.
Just thought I'd share what was dicovered while troubleshooting the 2 codes my truck spat out. By the way, I have a 2007 FJ with 155,000 kilometers or 96,000 miles.
Cheers,
FF