Fuel Filter, fuel pump, or catalytic converter? Or something else?
#1
Fuel Filter, fuel pump, or catalytic converter? Or something else?
I have a 91 4Runner 3.0 V6 3VZE with 176,000kms (109,400 miles)
It drives fine but I think it could get better mileage and it has a bitch of a time going up hills... I think I have narrowed it down to the fuel pump, fuel filter, or cat. It doesn't sputter or bog out at all, it's just sluggish... Any Ideas? Any insight will be appreciated. I will probably Change the filter no matter what.
It drives fine but I think it could get better mileage and it has a bitch of a time going up hills... I think I have narrowed it down to the fuel pump, fuel filter, or cat. It doesn't sputter or bog out at all, it's just sluggish... Any Ideas? Any insight will be appreciated. I will probably Change the filter no matter what.
#2
Registered User
iTrader: (1)
Just what are you comparing it with??
After all it is a 3.0
Manual or auto transmission??
A fuel filter and tune up can never hurt.
Fuel mileage how much stuff do you cart around the weight adds up fast .
I had a thousand feet of #01 welding cable That sort of got buried under a tarp I forgot about .
Tire size and pressure also impacts fuel mileage .
Your driving style as well makes a huge difference.
After all it is a 3.0
Manual or auto transmission??
A fuel filter and tune up can never hurt.
Fuel mileage how much stuff do you cart around the weight adds up fast .
I had a thousand feet of #01 welding cable That sort of got buried under a tarp I forgot about .
Tire size and pressure also impacts fuel mileage .
Your driving style as well makes a huge difference.
#4
Have you checked the air filter in a while? Fuel filter is also a good idea.
Also you could run some seafoam through the brake vac line plug
You said you narrowed it, have you done some stuff already?
Also you could run some seafoam through the brake vac line plug
You said you narrowed it, have you done some stuff already?
#5
Just what are you comparing it with??
After all it is a 3.0
Manual or auto transmission??
A fuel filter and tune up can never hurt.
Fuel mileage how much stuff do you cart around the weight adds up fast .
I had a thousand feet of #01 welding cable That sort of got buried under a tarp I forgot about .
Tire size and pressure also impacts fuel mileage .
Your driving style as well makes a huge difference.
After all it is a 3.0
Manual or auto transmission??
A fuel filter and tune up can never hurt.
Fuel mileage how much stuff do you cart around the weight adds up fast .
I had a thousand feet of #01 welding cable That sort of got buried under a tarp I forgot about .
Tire size and pressure also impacts fuel mileage .
Your driving style as well makes a huge difference.
#6
Upgraded to a K&N cold air intake. I seafoamed it. I tested the VAFM... I am trying to avoid the injectors hoping that they are good because they are $420 for six of them...
#7
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#8
Registered User
O2 sensors can fail over time and not throw a code, but just provide bad info to the ECU. If yours is original, then it probably needs replacing.
I have my timing set to factory 10 BTDC, and it runs like a champ. Powers uphill just fine (empty). You should definitely check to make sure it's in range.
It is also possible that the timing belt is off a tooth. That would definitely wreck your power also.
You could send your injectors out to witchhunter.com for cleaning if you are concerned about them. No need to spend so much cash. You can buy cheaper sets off eBay for less than that.
Good luck with it!
I have my timing set to factory 10 BTDC, and it runs like a champ. Powers uphill just fine (empty). You should definitely check to make sure it's in range.
It is also possible that the timing belt is off a tooth. That would definitely wreck your power also.
You could send your injectors out to witchhunter.com for cleaning if you are concerned about them. No need to spend so much cash. You can buy cheaper sets off eBay for less than that.
Good luck with it!
#9
O2 sensors can fail over time and not throw a code, but just provide bad info to the ECU. If yours is original, then it probably needs replacing.
I have my timing set to factory 10 BTDC, and it runs like a champ. Powers uphill just fine (empty). You should definitely check to make sure it's in range.
It is also possible that the timing belt is off a tooth. That would definitely wreck your power also.
You could send your injectors out to witchhunter.com for cleaning if you are concerned about them. No need to spend so much cash. You can buy cheaper sets off eBay for less than that.
Good luck with it!
I have my timing set to factory 10 BTDC, and it runs like a champ. Powers uphill just fine (empty). You should definitely check to make sure it's in range.
It is also possible that the timing belt is off a tooth. That would definitely wreck your power also.
You could send your injectors out to witchhunter.com for cleaning if you are concerned about them. No need to spend so much cash. You can buy cheaper sets off eBay for less than that.
Good luck with it!
Thanks. I really need to get the timing light.... I really hope the belt isn't off a tooth... That would suck. there's no way I can do that job myself $$$$. I suppose I will do the o2 sensor this weekend. I just finished changing my fuel filter and took it for a short drive. I will see how it goes up a decent sized hill tomorrow.
#11
I haven't. What will that tell me? I'll pull one out in the morning and see. Should I pull all six, or is one enough?
#12
All of em for sure, do it after warm engine. That way if you're running super rich you'll be able to smell the gas on them.
Let us know how it goes. Pics are always useful for forum diagnostics as well!
Let us know how it goes. Pics are always useful for forum diagnostics as well!
#13
Will do. I'm pretty sure I'm not running super rich though, especially after playing with the AFM. I leaned it out about 8 teeth and I could tell it was too much so I put it back. We'll see though! Also, I noticed nobody has even mentioned the possibility of a clogged cat. Is that not something i should worry about? It's a 23 year old truck.. It's just going to be such a bitch to get off that I have been neglecting it. I'm actually mostly concerned with the timing now. I'm starting to think it might be out. I did my fuel filter today and the gas was pretty nasty, but I really haven't noticed any improvement. Maybe just slightly. Anyways, I appreciate your input. I'm off to bed! Thanks again!
#14
Clogged cat is def a possibility. Mine (when I got the car) was bad. It had blown through, though.
No problem on the advice, sharing knowledge and trying to be helpful is one of the keys to being happy imo! Doesn't matter if it's online or in real life!
Best of luck to you, report back with how it goes
No problem on the advice, sharing knowledge and trying to be helpful is one of the keys to being happy imo! Doesn't matter if it's online or in real life!
Best of luck to you, report back with how it goes
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