very rapid ticks under moderate throttle...

Foxfan88 · May 21, 2005

it sounds funny, the first thing that comes to mind is the valvetrain
but its only happened since i put a full tank of 87 octane in.

Is this spark knock or what?
Happens only when your giving more than half throttle when you really hear it.
it sounds like rockers or something.

Any ideas??

I_AM_CANADIAN · May 21, 2005

stab in the dark, but it could also be loose plugs... or perhaps a loose header? Just something to think about.

Scott_B · May 21, 2005

yeah check your header bolts, make sure its not an exhaust leak.

HISSIN50 · May 21, 2005

Given what you posted, i agree with the detonation thoughts. if lowering the octane brought this on, that is where i would look.

does it happen to be much hotter of late where you are? (we were 108* today). that does not help - hotter motor (leading to preignition), hotter air charge, etc...... 87 might have been alright in winter, but not in the summer or hot temps.

good luck.

Foxfan88 · May 22, 2005

yeah it was pretty hot today, it doesnt really seem to do it all the time, or at least it dont notice as much.

I DONT WANT TO PAY MORE FOR GAS!!!!
i guess its the price to pay eh??

Foxfan88 · May 22, 2005

I was going to tighten the header bolts but the bolt is like right up on the pipe, can get a socket around it and its a too cramped to use a wrench.

HISSIN50 · May 22, 2005

Foxfan88 said:
yeah it was pretty hot today, it doesnt really seem to do it all the time, or at least it dont notice as much.

I DONT WANT TO PAY MORE FOR GAS!!!!
i guess its the price to pay eh??

you could back timing down if you want also.

and yeah, if it does not do it in cooler temps (like at night, or early in the morning), then it sounds like detonation, IMHO. you could also try some top end cleaner if you want.

good luck with it.

my$100project · May 22, 2005

HISSIN50 said:
Given what you posted, i agree with the detonation thoughts. if lowering the octane brought this on, that is where i would look.

does it happen to be much hotter of late where you are? (we were 108* today). that does not help - hotter motor (leading to preignition), hotter air charge, etc...... 87 might have been alright in winter, but not in the summer or hot temps.

good luck.

I would have to agree with hiss on this one. Don't go wasting your time until you try a higher octane fuel. Federal law dictates that fuel mixtures must be changed for different seasons of the year. Also you may want to search around. Where you think 91 is more expensive it may not be.....One gas stations mid grade may be 89 with premium @ 91 and the gas station across the street that is 2 cents higher may have midgrade @ 91 and premium @ 93. Also even though I beleive in using Ethanel. Just a quick lesson..... Ethanel is an octane booster (10% ethenel=2 octane boost ) I'm not sure if they changed the way it is mixed yet, but I know 2-3 years ago the trucks would fill 90% with fuel and dump 10% ethenel on top. It would mix on the way to the gas station. Well if you live close to the fuel point then your really getting 87 octane rather than 89 or 85 rather than 87, etc. This is why there was a lot of problems with ethanel a few years back.

my$100project · May 22, 2005

Double post--Can't find delete option

my$100project · May 22, 2005

You could retard your timing. But that in itself would both hurt performance and waste gas. burn time is around 1-2 ms and should be burned by 10 degrees ATDC. The most efficient gas mileage is around 10 degrees BTDC at idle. Ideally, you want to run as low octane as possible without detonation. Any higher ---in opposition to popular belief---will not increase performance or help in any way and only cost you more in the long run.

HISSIN50 · May 22, 2005

my$100project said:
You could retard your timing. But that in itself would both hurt performance and waste gas.

I thought of this line of thinking and did not comment (only saying he could retard his static timing) because I did not see where he posted what timing he is running. if he is at 14 or 15* base timing, certainly dropping it down a couple degrees and running 87 octane would not be a bad thing at all, IMHO.

my$100project · May 22, 2005

And I should not have automatically assumed he was running @ 10 degrees you are correct.

HISSIN50 · May 22, 2005

my$100project said:
And I should not have automatically assumed he was running @ 10 degrees you are correct.

We both are - we just need more info.

Half the posts I make i have to preface with contingencies because we don't know certain data that is 'need-to-know info'. I should have done that in my earlier post (by saying he could back his timing down IF he is indeed running more than 10*).

GREYFOX4INCH · Aug 26, 2005

dont run 87 its not good
trust me

HISSIN50 · Aug 26, 2005

GREYFOX4INCH said:
dont run 87 its not good
trust me

Care to elaborate? 87 is the fuel called for, and if one does not require more octane for their situation, running anything more will diminish performance and cost more.

jrichker · Aug 26, 2005

Part throttle pinging is a sign that the EGR may not be working properly. The EGR system adds exhaust gas to the air/fuel mixture, reducing the combustion temps. The computer adds timing to compensate for the slower burning mixture.

Dump the codes and look for a 3x Code, which would indicate EGR system problems.

Here's the link to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for years, and it works great.

See http://www.troublecodes.net/Ford/
OR
See http://www.mustangworks.com/articles/electronics/eec-iv_codes.html

IF your car is an 86-88 stang, you'll have to use the test lamp or voltmeter method. There is no functional check engine light on the 86-88's except possibly the Cali Mass Air cars.

Codes have different answers if the engine is running from the answers that it has when the engine isn't running. It helps a lot to know if you had the engine running when you ran the test.

Trouble codes are either 2 digit or 3 digit, there are no cars that use both 2 digit codes and 3 digit codes.

For those who are intimidated by all the wires & connections, see http://www.actron.com/product_detail.php?pid=16153 for what a typical hand scanner looks like. Normal retail price is about $30 or so at AutoZone or Walmart.

Or for a nicer scanner see http://www.midwayautosupply.com/detailedproductdescription.asp?3829 – It has a 3 digit LCD display so that you don’t have to count flashes or beeps.. Cost is $35.

HISSIN50 · Aug 26, 2005

Foxfan, it has been over 3 months since the thread was started - is it fixed yet?

Foxfan88 · Aug 26, 2005

wow this is old. I learned a while back my motor is just weak and i can hear some valvetrain. Not a detenation problem.
Car is doing good nowadays, except its slow

very rapid ticks under moderate throttle...

Foxfan88

My Grandpa has great wood.

I_AM_CANADIAN

Member

Scott_B

"1 Arm Wonder! "

HISSIN50

"How long does it take to get help in here?

Foxfan88

My Grandpa has great wood.

Foxfan88

My Grandpa has great wood.

HISSIN50

"How long does it take to get help in here?

my$100project

New Member

my$100project

New Member

my$100project

New Member

HISSIN50

"How long does it take to get help in here?

my$100project

New Member

HISSIN50

"How long does it take to get help in here?

GREYFOX4INCH

Member

HISSIN50

"How long does it take to get help in here?

jrichker

StangNet's favorite TOOL

HISSIN50

"How long does it take to get help in here?

Foxfan88

My Grandpa has great wood.

Similar threads

very rapid ticks under moderate throttle...

My Grandpa has great wood.

Member

"1 Arm Wonder! "

"How long does it take to get help in here?

My Grandpa has great wood.

My Grandpa has great wood.

"How long does it take to get help in here?

New Member

New Member

New Member

"How long does it take to get help in here?

New Member

"How long does it take to get help in here?

Member

"How long does it take to get help in here?

StangNet's favorite TOOL

"How long does it take to get help in here?

My Grandpa has great wood.

Similar threads

Privacy & Transparency

Privacy & Transparency