Will Fuel Filter cause an intermittent problem ???
Thread Starter
Intermediate
Joined: Jan 2002
Posts: 36
Likes: 0
From: los angelos ca
Will Fuel Filter cause an intermittent problem ???
I have an 88 vette with L98... I've done all i could think of to get my car to run right. the list below is what i've done.
New cap, rotor, wires, plugs
New IAC, O2 sensor
Checked timing
No codes and good gas mileage
The problem is it sometimes it has awesome power and sometimes it is a total basketcase... Like tonight i floored it from a stop and i felt like i wasn't even stepping on the gas. Idled fine and the funny thing was is that i set my MPG stayed about the same after i floored it... Seems like it proved that it wasn't getting any gas at that moment. I know i could hook up the fuel pressure gauge and drive it and see but whats weird is it doesn't run this bad all the time. Sick of Runs awesome then Runs like a escort... Does this sound like the fuel filter *(but mind you it's intermittant) or maybe the injectors...???
[Modified by jmzooooo, 7:13 AM 5/27/2002]
New cap, rotor, wires, plugs
New IAC, O2 sensor
Checked timing
No codes and good gas mileage
The problem is it sometimes it has awesome power and sometimes it is a total basketcase... Like tonight i floored it from a stop and i felt like i wasn't even stepping on the gas. Idled fine and the funny thing was is that i set my MPG stayed about the same after i floored it... Seems like it proved that it wasn't getting any gas at that moment. I know i could hook up the fuel pressure gauge and drive it and see but whats weird is it doesn't run this bad all the time. Sick of Runs awesome then Runs like a escort... Does this sound like the fuel filter *(but mind you it's intermittant) or maybe the injectors...???
[Modified by jmzooooo, 7:13 AM 5/27/2002]
Racer
Joined: Aug 2000
Posts: 491
Likes: 0
From: Houston, Texas
Re: Will Fuel Filter cause an intermittent problem ??? (jmzooooo)
Doesn't sound like fuel filter. The computer uses your injector pulse width and speed to find your miles per gallon. If it doesn't change maybe it's on average mode or if it's on instant then that means your pulse width did not go up when you stomped the gas.
Your computer would use your TPS, MAF, O2 (if it's lean) sensor to calculate the needed pulse width (it uses the TPS to determine WOT mode).
I'm thinking it's a bad injector more so than the fuel filter, but who knows. Change the filter first, it's cheaper.
Your computer would use your TPS, MAF, O2 (if it's lean) sensor to calculate the needed pulse width (it uses the TPS to determine WOT mode).
I'm thinking it's a bad injector more so than the fuel filter, but who knows. Change the filter first, it's cheaper.
Thread Starter
Intermediate
Joined: Jan 2002
Posts: 36
Likes: 0
From: los angelos ca
Re: Will Fuel Filter cause an intermittent problem ??? (Red94Vette)
I will change the fuel filter first... Hopefully it fixes it. Very weird that light throttle could be good and when i ask for WOT it just laughs !!! Sometimes... That's what's puzzling.
Thread Starter
Intermediate
Joined: Jan 2002
Posts: 36
Likes: 0
From: los angelos ca
Re: Will Fuel Filter cause an intermittent problem ??? (jmzooooo)
I just changed my fuel filter today... It seemed to start up quicker and maybe idled a bit smoother. Took it out to see how it responded now and it seems to accelerate the same or better than before... Will see if it starts to act up again later. Went to a parking lot by my house and did a couple tire smoking donuts :D :D :D
Seems to be running great.... :cheers:
Seems to be running great.... :cheers:
Thread Starter
Intermediate
Joined: Jan 2002
Posts: 36
Likes: 0
From: los angelos ca
Re: Will Fuel Filter cause an intermittent problem ??? (devilfish)
Yeah i checked it not to long ago... Was at 4.8 volts i believe and responded smoothly through changes with the throttle. Didn't check it when it ran poorly though. Might be intermittant, who knows. Will see later if it does the same thing...
Burning Brakes
Joined: Aug 2001
Posts: 1,238
Likes: 0
From: walled lake MI
Re: Will Fuel Filter cause an intermittent problem ??? (jmzooooo)
Yeah i checked it not to long ago... Was at 4.8 volts i believe and responded smoothly through changes with the throttle. Didn't check it when it ran poorly though. Might be intermittant, who knows. Will see later if it does the same thing...
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Burning Brakes
Joined: Aug 2001
Posts: 1,238
Likes: 0
From: walled lake MI
Re: Will Fuel Filter cause an intermittent problem ??? (jmzooooo)
What do you mean "take it out to see if feels similiar"
intermittent TPS failures are tough to catch, and i don't even know if the C4's have this type of diagnostic. if this is the case, the TPS can go bad for a split second and still not set off a code, while it will still make the car feel like a dog for that moment.
just a suggestion. hope you find the problem!
[Modified by tempest, 9:42 PM 5/30/2002]
Thread Starter
Intermediate
Joined: Jan 2002
Posts: 36
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From: los angelos ca
Re: Will Fuel Filter cause an intermittent problem ??? (tempest)
Thanks for the input... I changed the fuel filter on Tuesday and it hasn't screwed up, YET... Knock on wood... :smash: Going to work this weekend and i'll see if its still consistantly running good......
