Okay still can't figure this ping out. On the highway in 4th or 5th gear I can start to hear the engine ping at around 2500 rpm or so when getting on it about 75% throttle. Engine is modded a little, headers, cam, intake ported, borla exhuast. Not much at all. New spark plugs, wires, dist. cap and rotor, new fuel pump, filter, cleaned and flow matched 17lb injectors, adjustable fpr set at 40-41psi at idle what should it be at wot? I have a fp gauge to monitor the idle not sure about wot. The timing is set at 10 degrees advanced too. The day I was on the highway driving it pinged when the weather was maybe 70 outside and I have the fan always running and a 180t-stat. I am also running the NGK plugs. What else could be causing this, I have a custom prom burned by Lyndon (Wester's Garage). Just kind of stumped my 3.4L should not ping, I could feel it ping a little worse if I turned the AC on as well. Should my engine ping at all even with the ac on during the summer or is that something that might be a little more common? Let me know guys what ya think. Thanks.

Amir

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Maroon 1987 GT 5 spd: 2.8L
Ferrari Red 1988 Formula 5 spd: 3.4L

My Website: http://www.members.cox.net/rare88/

[This message has been edited by Rare87GT (edited 03-28-2003).]

1. Your ping noise might be generated by something besides the engine ignition. Doubtful, but possable.

2. Engine pinging is generally caused by an over lean condition, ie. the fuel/air ratio is too lean, requiring more fuel to enrichen the mix.

Operating with pinging due to an over lean condition will quickly lead to engine meltdown. You might try adjusting your ignition advance, ie. retarding it a bit, first. If that doesn't work, try increasing the fuel pressure in increments.

Are you using the ALDL scan, it can help a lot.

3. call Wester's

Amir,

I have been told that SOME 3.4s are happier with 4-6 degrees of time. Why not try backing down to 8-degrees. If no ping or loss of performance, you may be good to go.

WinALDL is a good idea. You will be able to see when/if it is leaning out, and you can give Wester's the information.

Luck!

You could try bumping the fuel pressure up to 42-43 and try running it again. This should tell you if it's a fuel problem.

I would try the fuel first, If it doesn't help then start with the timing.

Also leaks in the EGR tube or other vacuum leaks can cause pinging also. Just another area to check.

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Happiness isn't around the corner...
Happiness IS the corner.

try 92 octaine and see if it helps,

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Rich
97 Eclipse GS-T not stock
92 325i-- intake, exhaust, and suspension
White 86 SE V6-- WCF 2" drop springs, coil-overs, KYb's

Is your EGR even working? It has all of the symptoms of the EGR being closed. If you removed it have Lyndon zero out the EGR advance adder.

If you find out what's causing the pinging, please let me know. I've been fighting this problem ever since I put the 3.4 in last year. I've tried various degrees of timing(6-8-10), 93 octane fuel, replaced the egr valve, steel vacuum lines, etc. I would LOVE to know what the problem is.

I'm thinking of putting in a knock sensor, as the 3.4 had one anyway. So far I've picked up the computer that supports it, and got a prom burner, etc.

Next I'm probably going to buy TK's programmer software, and see if anyone out there has any good maps for running with the knock sensor hooked up.

Of course I'm also thinking of changing the map to support the 2 bar MAP sensor so when I turbo it I don't have to add a second device to handle the ignition adjust under boost.

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87 GT 3.4 V6 Fiero 4spd Overdrive Automatic

What brand of gas are you using? And is it the same brand you've been using all along?

Many people will swear it doesn't make a difference, but my Sonoma pings on Racetrac (admittedly cheesy) gas, where it doesn't on other brands.

FWIW, Jeremy (from Fiero Factory) said that he has had more trouble with Shell pinging that with a lot of other brands. Said it was especially troublesome when he was trying to burn a chip for a turbo'd motor.

Of course, I found this out after I filled up with two tanks of Shell. And it *does* ping a slight bit on Shell gas.
Since I put a different brand (Citgo?) in it last time, I haven't had a chance to really test it (only does it on the hwy), but it seems to be a bit better.

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Raydar

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Phuk Phrance! ...until I'm told to change it.

I run 91 octane all the time, never have run anything less. The fuel pressure is set at around 40psi at idle. My question is could my regulator be bad or something and not opening up for allowing more fuel up high. When I rev up the engine in my garage and monitor the fuel pressure gauge it doesn't move at all and pretty much goes from 40 to 41 or so. So I should try setting the timing lower at like 8 degrees instead of 10? I might have to give that a shot and see what happens. On my EGR valve it is removed from the computer and the code 32 is removed as well. Anything else that the EGR could be causing. I mean it pinged even when I had the EGR enabled in the chip with my stock one back 5 months ago. Any other clues? I think 6-8 degrees of timing and 42 psi of pressure might do it. But I just thought that when the car is running the fuel pressure should be set at 38-42psi at idle and should go up when you floor the engine or am I wrong?

Thanks.

Just checking on results???

Lean condition for sure.......make sure the EGR valve is working at all. Bring your boost press up to about 45-47, perhaps even replace injectors with #19's.

REPLACE SPARKPLUGS WITH AC R42TS SPARKPLUGS

Set timing back a little bit to see if there is any diff. About 2 degrees at a time. Good luck!

Phil

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87 FIERO GT 2.8 5spd
0-60 in 6.8 seconds!