Ok many of you know I have been battling a ping issue . I had a thought could the EBAY 3.5 hfm I bought on ebay NIB for a 1/3 of the price of others be a bootleg or a regular one with only a larger housing . I just swapped a stock size s50 unit into the car and took it for a ride and I have noticed no difference in the cars performance or the Pinging . I removed the sensor itself from the housing on the 3.5 and it has no numbers on it to verify . Would this cause a ping if it truly is a regular one in a large body ? Would you try the real thing to rule this ? out . THANKS !
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How much did you pay for it? I don't think I've heard of a fake 540 HFM before!
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Things I would look at if I had knock (pinging) issues, in no particular order:
- Injectors functioning properly: delivering enough fuel? Sized properly?
- Plugs: Are they in good shape? Cracked insulators can be a source of pre-ignition. Are the the right temp range?
- Timing: what is the total advance vs. stock with your chip?
- Knock sensor: functioning properly?
- Dyno / Logging Wideband O2: I would be curious to see what my AFR's looked like.
- HFM: Doubt it's faulty since the stock size still leads to pinging.Comment
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120.00 shipped NIB . funny thing is I can not even find the auction on ebay of my feedback . The guy was in GA , he had a bunch of them now poof he is gone . Anyone know if the sensor is different or just the housing ?Comment
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Anyway to test it to find out if it's the real deal ?Comment
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find a bosch part number somewhere on it?Comment
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on housing rf 280 218 800
on sensor no # at all .
I pulled the sensor out of a 3" and it clearly reads bosch on the sensor itself unlike the unit I have . I pulled the trigger on a new unit from the dealer the 3.5 euro unit. I will let you know if this corrects the issue of adds any performance . I smell a rat !Last edited by ericzz; 08-06-2007, 08:06 AM.Comment
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if you have a euro hfm and dont have a special chip specifically for it your car will run like crape30sport.net
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I have a turner chip and 24# injectors it's all matched !I just think I have some kind of knockoff hfm .Comment
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If you're still pinging on a real 3" hfm, wouldn't you figure the HFM is fine?
Are you sure your chip is for a 3.5" HFM? You gave the other stats, but not that.
It's not how you handle the good times, but the faith you keep in the bad that defines you.Comment
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Yes it's the chip tuned for 3.5hfm 24lbs and it's from turner . I am just ruling things out . I am thinking it's a poor quality hfm I know it's not a bosch unit . There was no change in the car form the 3" to the 3.5" I currently have . I am also going to get a 506 dme and try that with stock chip and stock injectors and the 3" hfm .Comment
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have you tried toluene in gas?Comment
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Eric maybe you ought to take a short ride out to Bridgewater and borrow Beir's HFM and ECU to see if it's truely the issue or does someone else have the parts you need nearby?Comment
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Thanks I have the stuff in route allready .Comment
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