pinging again - where's the fuel cut
12-21-01, 02:00 PM
#1
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pinging again - where's the fuel cut
Yep - 30degree weather, OEM fuel/turbo, a perf exhaust & downpipe.
4th gear - full boost - PING!!!!!! - sounded like someone hitting a tin can really hard.
I thought fuel cut would hit before it would ping.
The OEM boost gague rises EXTREEMLY fast all the way to 1 bar (usualy only 3/4 of the way up). Guess I'm getting some boost creep.
4th gear - full boost - PING!!!!!! - sounded like someone hitting a tin can really hard.
I thought fuel cut would hit before it would ping.
The OEM boost gague rises EXTREEMLY fast all the way to 1 bar (usualy only 3/4 of the way up). Guess I'm getting some boost creep.
12-21-01, 02:02 PM
#2
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Re: pinging again - where's the fuel cut
Originally posted by vaughnc
Yep - 30degree weather, OEM fuel/turbo, a perf exhaust & downpipe.
4th gear - full boost - PING!!!!!! - sounded like someone hitting a tin can really hard.
I thought fuel cut would hit before it would ping.
The OEM boost gague rises EXTREEMLY fast all the way to 1 bar (usualy only 3/4 of the way up). Guess I'm getting some boost creep.
Yep - 30degree weather, OEM fuel/turbo, a perf exhaust & downpipe.
4th gear - full boost - PING!!!!!! - sounded like someone hitting a tin can really hard.
I thought fuel cut would hit before it would ping.
The OEM boost gague rises EXTREEMLY fast all the way to 1 bar (usualy only 3/4 of the way up). Guess I'm getting some boost creep.
Do you have an upgrade fuel pump????
-Ted
12-21-01, 02:14 PM
#3
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Thread Starter
OEM ECU - that's what's strang about it, it's suppose to cut fuel.
I haven't put on a perf intake yet because the downpipe & exhaust upgrades cause 8PSI boost creeps - then imagine a perf intake (yowza).
I've been thinking of an aftermaret ECU & boost controller to keep the OEM setup in line.
Mazcare mentioned I should check the pills in the vacuum lines as if they're missing they might also be causing my deceleration harshness.
I haven't put on a perf intake yet because the downpipe & exhaust upgrades cause 8PSI boost creeps - then imagine a perf intake (yowza).
I've been thinking of an aftermaret ECU & boost controller to keep the OEM setup in line.
Mazcare mentioned I should check the pills in the vacuum lines as if they're missing they might also be causing my deceleration harshness.
12-21-01, 02:20 PM
#4
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Originally posted by vaughnc
thinking of an aftermaret ECU & boost controller to keep the OEM setup in line.
thinking of an aftermaret ECU & boost controller to keep the OEM setup in line.
Mazcare mentioned I should check the pills in the vacuum lines as if they're missing they might also be causing my deceleration harshness.
-Ted
12-21-01, 02:32 PM
#5
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RETed,
Mazcare's performed the 60K services & spark plug wire repalcements. Could be something in the ignition, but the manual mentions the dashpot and several other parts that control the deceleration as most likely cause. Of course the manual is only right 1/2 the time anyway
Basically if you let off the gas in gear the car should not jerk - with or without boost. It's most apparent in traffic in 2nd gear. Tap the gas, let off, tap the gas - should be smooth and not jerk.
Worse is 4th gear @ full bost & letting off - huge engine jerk.
Well the the body/drivetrain has 145K and the engine has 28K - so I'm not surpised on these minor annoyances. Just want to work through them Hope it's not related to having a downpipe though (ie less backpressure).
The manual recommends removing and checking certain pieces of the deceleration system, so I might do that after mazcare gets my other FC I just picked up in good shape (89 FC convertible).
Anyway I'm trying to get into repairing my own stuff - so any thoughs you might have on boost creep or deceleration would be great
Thanks
-- vaughnc
Mazcare's performed the 60K services & spark plug wire repalcements. Could be something in the ignition, but the manual mentions the dashpot and several other parts that control the deceleration as most likely cause. Of course the manual is only right 1/2 the time anyway
Basically if you let off the gas in gear the car should not jerk - with or without boost. It's most apparent in traffic in 2nd gear. Tap the gas, let off, tap the gas - should be smooth and not jerk.
Worse is 4th gear @ full bost & letting off - huge engine jerk.
Well the the body/drivetrain has 145K and the engine has 28K - so I'm not surpised on these minor annoyances. Just want to work through them
Hope it's not related to having a downpipe though (ie less backpressure).The manual recommends removing and checking certain pieces of the deceleration system, so I might do that after mazcare gets my other FC I just picked up in good shape (89 FC convertible).
Anyway I'm trying to get into repairing my own stuff - so any thoughs you might have on boost creep or deceleration would be great
Thanks
-- vaughnc
Last edited by vaughnc; 12-21-01 at 02:35 PM.
12-21-01, 02:35 PM
#6
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its was around 30-40 degrees today and i took the T2 out to run some errands...and i was hammering it! (ask vosko! haha) still no fuel cut...and no FCD. just one ported wastegate 
(ask vosko! haha) still no fuel cut...and no FCD. just one ported wastegate
12-21-01, 02:38 PM
#7
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Originally posted by vaughnc
Basically if you let off the gas in gear the car should not jerk - with or without boost. It's most apparent in traffic in 2nd gear. Tap the gas, let off, tap the gas - should be smooth and not jerk.
Worse is 4th gear @ full bost & letting off - huge engine jerk.
Basically if you let off the gas in gear the car should not jerk - with or without boost. It's most apparent in traffic in 2nd gear. Tap the gas, let off, tap the gas - should be smooth and not jerk.
Worse is 4th gear @ full bost & letting off - huge engine jerk.
If it's an early Zenki model, I'd blame the TPS.
-Ted
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12-21-01, 02:39 PM
#8
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yeah I've had porting the wastegage in the back of my mind too, but I can't get all my ducks in a row
1) get micky mouse gague pod in from Japan 2) install a decent boost gague and see for myself what PSI I'm running 3) fix boost creep 4) fix deceleration
And now I've thrown another FC into the mix
And let's not forget the vibration in the steering wheel & getting a perfect allignment as well. I've been eyeing that sweet engine brace/strut tower brace/torque brace they have to help with some of the vibration.
What's funny - mazda nor mazcare offers an engine balance - what's up with that ??
all minor stuff I know.
1) get micky mouse gague pod in from Japan 2) install a decent boost gague and see for myself what PSI I'm running 3) fix boost creep 4) fix deceleration
And now I've thrown another FC into the mix
And let's not forget the vibration in the steering wheel & getting a perfect allignment as well. I've been eyeing that sweet engine brace/strut tower brace/torque brace they have to help with some of the vibration.
What's funny - mazda nor mazcare offers an engine balance - what's up with that ??
all minor stuff I know.
Last edited by vaughnc; 12-21-01 at 02:45 PM.
12-21-01, 02:59 PM
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Originally posted by vaughnc
91 Turbo II
.... note to self - look up Zenki and Kouki ....
91 Turbo II
.... note to self - look up Zenki and Kouki ....
i was all about adjusting the TPS...but it seems as if this solved my problem. i've heard mixed feelings on the 89-91 TPS...some say its self adjusting...others say no, you still have to turn the screw. oh well...will we ever know??? lol
12-21-01, 03:00 PM
#11
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Originally posted by vaughnc
91 Turbo II
.... note to self - look up Zenki and Kouki ....
91 Turbo II
.... note to self - look up Zenki and Kouki ....
Zenki literally means "before".
Kouki literally means "after".
This designates the model change between 1988 and 1989.
The Aussies use Series IV/Series V - same smell.
-Ted
12-21-01, 03:05 PM
#12
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Erik,
I'll take a look. The TIIs have the throttle cable going around the intercooler and back. I believe the holding bracket was pretty tight last time I check though.
I'll take a look. The TIIs have the throttle cable going around the intercooler and back. I believe the holding bracket was pretty tight last time I check though.
12-21-01, 03:12 PM
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Originally posted by vaughnc
Basically if you let off the gas in gear the car should not jerk - with or without boost. It's most apparent in traffic in 2nd gear. Tap the gas, let off, tap the gas - should be smooth and not jerk.
Basically if you let off the gas in gear the car should not jerk - with or without boost. It's most apparent in traffic in 2nd gear. Tap the gas, let off, tap the gas - should be smooth and not jerk.
-Tesla
12-21-01, 03:23 PM
#14
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Originally posted by tesla042
On my 88 n/a, in low gears, it does this.. It's horrible in 1st gear in traffic.. really throws you around.. Tho, my TPS changes very linearly...no spikes or anything.
On my 88 n/a, in low gears, it does this.. It's horrible in 1st gear in traffic.. really throws you around.. Tho, my TPS changes very linearly...no spikes or anything.
-Ted
12-21-01, 04:43 PM
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Re: pinging again - where's the fuel cut
Originally posted by vaughnc
Yep - 30degree weather, OEM fuel/turbo, a perf exhaust & downpipe.
4th gear - full boost - PING!!!!!! - sounded like someone hitting a tin can really hard.
I thought fuel cut would hit before it would ping.
The OEM boost gague rises EXTREEMLY fast all the way to 1 bar (usualy only 3/4 of the way up). Guess I'm getting some boost creep.
Yep - 30degree weather, OEM fuel/turbo, a perf exhaust & downpipe.
4th gear - full boost - PING!!!!!! - sounded like someone hitting a tin can really hard.
I thought fuel cut would hit before it would ping.
The OEM boost gague rises EXTREEMLY fast all the way to 1 bar (usualy only 3/4 of the way up). Guess I'm getting some boost creep.
12-21-01, 08:46 PM
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Originally posted by RETed
Might be as simple as a misadjusted TPS...
-Ted
Might be as simple as a misadjusted TPS...
-Ted
these cars are old... they are not going to be perfect. I just learn to live with it.
12-21-01, 10:06 PM
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Originally posted by vaughnc
Erik,
Haven't put it on yet as I know I'm already getting boost creap from the perf exhaust & cat.
Erik,
Haven't put it on yet as I know I'm already getting boost creap from the perf exhaust & cat.
12-22-01, 12:05 AM
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Re: pinging again - where's the fuel cut
Originally posted by vaughnc
Yep - 30degree weather, OEM fuel/turbo, a perf exhaust & downpipe.
4th gear - full boost - PING!!!!!! - sounded like someone hitting a tin can really hard.
Yep - 30degree weather, OEM fuel/turbo, a perf exhaust & downpipe.
4th gear - full boost - PING!!!!!! - sounded like someone hitting a tin can really hard.
How old are your plugs? Mine developed a ping in the last week. I was thinking I got some bad gas. I raised the octane but it didn't help. I retarded the timing 6 deg's and it still didn't help and it also started missing and backfiring. It scared the **** out of me and I figured it was engine time. Worn Plugs! Mine only had a few thous. miles but they were well worn. Nice and tan/brown but way worn down. I put some new ones in tonight and voila! I also went w/ 4 BUR9EQ's. It had 7's before.
Runs great now. Wish the track was still open, I ran a 13.19 @ 104 on these plugs last month.
Scott
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