Acis promblem from hell

[86yota]

hey everyone for about two weeks my rebuild 86.5 7mge has been acting weird. And after some research i think i have pin pointed my problem to the ACIS system just want to ask some other owners what they think....

The problem begins right from 1st gear, first is that it has very little torque,now the real problem comes into play almost every time i get to 4 g's the engine almost feels like its just saying NO and wont rev past, forcing me to shift into 2nd and the same thing happens again, shift in to 3rd and it usually sails right past 4 and 5th is the same smoothness. Now its weird because sometimes in 1st if iam "geting it" and just kinda floor it, she will sail past 4000 easy same with second and the rest....

Iam just not certain whats the problem the Acis should be working the whole time right ? ive been looking here for some answers

http://www.geocities.com/mwsupra2003/acis.html


But any thing helpful is greatly appreciated thanks guys and gals.

[IJ.]

Usually when ASIC's is broken you get a surge at 4K.

[86yota]

Usually when ASIC's is broken you get a surge at 4K.

alright well i found one test for it ..i read that u can simply watch and see if the valve opens or closes right? or is there more to that. ??

[IJ.]

Even if it were totally disconnected I don't think it would cause the issues you describe.

Is the car throwing any codes?

[CRE]

alright well i found one test for it ..i read that u can simply watch and see if the valve opens or closes right? or is there more to that. ??

Usually that will do.

Checked the timing?

[AJ'S 88NA]

Really does sound like a timing problem. Have you had a light on it, and have you checked your cam gears to make sure they are lined up? A lot of people do not rotate the motor a couple of times after installing the timing belt, and then re-adjust if necessary. While you're doing all that check and make sure everything else is in time, #1 on TDC, crank pulley on the mark, cam gears on the marks, and rotor pointing at #1 wire.

[86yota]

Really does sound like a timing problem. Have you had a light on it, and have you checked your cam gears to make sure they are lined up? A lot of people do not rotate the motor a couple of times after installing the timing belt, and then re-adjust if necessary. While you're doing all that check and make sure everything else is in time, #1 on TDC, crank pulley on the mark, cam gears on the marks, and rotor pointing at #1 wire.

i might be a good lead into my problem but if the timing was off wouldn't it me be off the whole time...what i mean is i was just diving it a few ago and it felt good the time but i still have no torque in low gears.

iam going to have to get a light on it, and recheck every thing anyway just to be sure. Thanks for the advice ill repost with results thanks alot.

[AJ'S 88NA]

i might be a good lead into my problem but if the timing was off wouldn't it me be off the whole time...what i mean is i was just diving it a few ago and it felt good the time but i still have no torque in low gears.

iam going to have to get a light on it, and recheck every thing anyway just to be sure. Thanks for the advice ill repost with results thanks alot.

It could be off still. If the cams are off it won't run right, since you didn't put a light on it from the start, your base timing is probably off, which it could run ok some of the time, and like shit others. I can't believe you have rebuilt the motor and havn't put a light on it. And you wonder why it isn't running right :3d_frown: No offence but I learned a long, long time ago,that is one of the first things you check after you get it up and running. The first thing is if you have anything pouring out the motor.

[86yota]

It could be off still. If the cams are off it won't run right, since you didn't put a light on it from the start, your base timing is probably off, which it could run ok some of the time, and like shit others. I can't believe you have rebuilt the motor and havn't put a light on it. And you wonder why it isn't running right :3d_frown: No offence but I learned a long, long time ago,that is one of the first things you check after you get it up and running. The first thing is if you have anything pouring out the motor.

AYE..was a mistake i should have known better ...even though somone who helped put it together said check it with a light. i guess i was just excited to have it back and running should have payed for attention to detail ..but ill head over to the local shop and see if hes has a light i can borrow tomorrow ...thanks again ill let you know how it goes.

[CRE]

:nono: Damned nooBies.....


J/k, I'm glad it's something simple.

[DegreE]

Usually when ASIC's is broken you get a surge at 4K.

Yeah, my 89 N/A does it. Its funny becasue it reminds me of vtec. lol I miss my civic hatch.

[AJ'S 88NA]

:nono: Damned nooBies.....


J/k, I'm glad it's something simple.

Now, now, don't get your panities all twisted :)

I'd check your cam gears, easy to pull the front cover and the distributor cap to check some simple things too.

[cuel]

In order for the ACIS to cause the symptoms you're describing, the valve would have to be locked closed. There is a spring inside the intake that physically locks it open if the ACIS system malfunctions.

I think you need to check the timing, but I'd also look into plugs and wires.

[86yota]

hmmm thanks ill look into that spring and valve because after my rebuild some of the vacuum line where not put back right. there could be a chance its lock closed iam off tomorrow so ill do it all then thanks again .

[Finnon]

Yeah, my 89 N/A does it. Its funny becasue it reminds me of vtec. lol I miss my civic hatch.

my na does it aswell. i thought it was suposed to do that lol

[86yota]

my na does it aswell. i thought it was suposed to do that lol
does your car also feel like it has no torque ? cause i have like none no balls outa first or into second.

[AJ'S 88NA]

does your car also feel like it has no torque ? cause i have like none no balls outa first or into second.Check your timing:)

[86yota]

yeah yeah iam getting a light on to tomorrow let you all know how it goes.

[86yota]

quick question to anyone logged in i connect the light to the connector to the rely box on the battery side right? then i time it off the crank right? not sure i have never used a timing light before iam going to a local shop and wanted have some sort of idea on how to use it. anything is helpful thanks.

[Rennat]

red cable = + side of battery
black cable = - side of battery

then you normally connect another "clamp" style thing onto the number one sprak plug wire to puck up the signal, then you point at the crank/timing cover plate where those little numbers are.

[AJ'S 88NA]

quick question to anyone logged in i connect the light to the connector to the rely box on the battery side right? then i time it off the crank right? not sure i have never used a timing light before iam going to a local shop and wanted have some sort of idea on how to use it. anything is helpful thanks.http://cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=IG&P=20
You have to jumper the terminals. The red goes to the +side of the battery and the black goes to ground. Then you will have the sensor wire that normally clips on the #1 plug wire, some times on the older lights you have to pull the plug wire and insert a probe and connect back to the plug.

[isnms]

...ive been looking here for some answers

http://www.geocities.com/mwsupra2003/acis.html...

I learned something today.

[86yota]

I learned something today.

that helped alot thanks for the knowledge heading over there around 2 hopefully she runs better.

[CRE]

You MUST set the ECU for the diagnostic mode by jumping the two red contacts indicated here:
http://www.cygnusx1.net/Supra/TechTips/engine_error_codes.aspx

Timing instructions:
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=IG&P=20



EDIT: Damn I'm getting slow... This whole work thing gets in the way too much. :(

[AJ'S 88NA]

You MUST set the ECU for the diagnostic mode by jumping the two red contacts indicated here:
http://www.cygnusx1.net/Supra/TechTips/engine_error_codes.aspx

Timing instructions:
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=IG&P=20



EDIT: Damn I'm getting slow... This whole work thing gets in the way too much. :(Ha Hah. beat you to it this time:)

[86yota]

well we checked the timing and was off by 5 degrees it made a difference in the
way it runs..but it still if me the same problem when slowly accelerating at 4g's
it kinda stops and i still am forced to shift. torque is still lacking too.

iam going to look into what cuel said about the valve. i think this might have happened gotta at least check it.

"In order for the ACIS to cause the symptoms you're describing, the valve would have to be locked closed. There is a spring inside the intake that physically locks it open if the ACIS system malfunctions."

[cuel]

Actually, I was trying to point out that, unless the spring broke, or was removed, there is no way for it(ACIS valve inside the intake) to lock closed. I had to physically tie it closed when I tested it. It would be locked open, and you would get the "surge" at around 3800 to 4k that everyone else describes, if you where having an ACIS issue.

For what you're describing, I'd probably suspect fuel pressure or flow issues.

For those with the surge: Check the vacuum lines under the intake. They're a pain to see, but you have a leak somewhere. It does make a difference ;)

[CRE]

OH! You even had me confused as to what you meant about the return spring...


OP, test the VAF (AFM) with the car's ignition on but the engine off check to see that you're getting an even and steady voltage scale from the VS line as you manually move the vane. It should start at around 4.8v - 4.9v when fully closed and drop steadily as you open the flap.

It wouldn't hurt to set up a meter and have someone ride with you and see what the Vf feedback is saying when the engine starts giving up.

The VAF IS a wear component... it's life is finite and they do need replacing periodically due to nothing more than wear. That's why I threw mine out. ;)

[IJ.]

Wouldn't matter even if it did I seriously doubt it would cause the issues described.... ;)

[CRE]

Wouldn't matter even if it did I seriously doubt it would cause the issues described.... ;)

If you're referring to the VAF, I'm disinclined to agree. At least in the case of acceleration. If the signal's coming across lower than it should due to wear and the ECU's running closed loop, you'll go rich as hell. Given that the VAF uses a wiper it doesn't necessarily degrade evenly.

[IJ.]

Nah I was talking about the ASIC's valve/spring ;)

[CRE]

Nah I was talking about the ASIC's valve/spring ;)

Yeah, that occurred to me right after I posted. :icon_razz

[86yota]

well instead of doing all the testing i just droped in a spare VAF that i had around and on my test drive it worked perfectly no more hesitation at 4000rpms runs right past it. i still kinda feel that my torque is low feels better but not 100% but ill have to figure that out some other day off. thanks for all the help.

[AJ'S 88NA]

well instead of doing all the testing i just droped in a spare VAF that i had around and on my test drive it worked perfectly no more hesitation at 4000rpms runs right past it. i still kinda feel that my torque is low feels better but not 100% but ill have to figure that out some other day off. thanks for all the help.

You can bump up your timing a few degrees as long as you use better grade fuel.

[CRE]

You can bump up your timing a few degrees as long as you use better grade fuel.

Personally, I'd refrain from running anything other than factory specs if you're not sure if the car is in good running order.

As for bumping the timing, a healthy 7M-GE can take a significant bump without upping the octane level.


86yota, what octane are you running anyway?

[86yota]

Personally, I'd refrain from running anything other than factory specs if you're not sure if the car is in good running or der.

As for bumping the timing, a healthy 7M-GE can take a significant bump without upping the octane level.


86yota, what octane are you running anyway?


usually 87 octane but once in awhile somthing a little higher gas here in pa has hit 4.25 thats just crazy. but u just bought a new fuel filter gods knows when the d-bag before changed it. i spend a few minutes trying to figure out where it is located i got two answers in the gas tank and on the engine ?

[AJ'S 88NA]

usually 87 octane but once in awhile somthing a little higher gas here in pa has hit 4.25 thats just crazy. but u just bought a new fuel filter gods knows when the d-bag before changed it. i spend a few minutes trying to figure out where it is located i got two answers in the gas tank and on the engine ?
If you're asking were the fuel filter is it's above the pumpkin on the outside of the tank.

[CRE]

it's between the tank and the diff. Do a search for more details... it can be a real pain to replace.

[86yota]

it's between the tank and the diff. Do a search for more details... it can be a real pain to replace.

ya that should help ill log onto alldata and find out some details about it.
thanks