Timing issue IDK help please - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 27 Old 06-02-2019, 09:09 PM Thread Starter
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Timing issue IDK help please

I have a 1995 mustang GT I'm am getting a few codes like mass air flow, air intake tempature sensor, I have the correct firing order,new spark plugs gaped at .052 and wires, fuel pressures good 40psi , I set timing to 10btdc and it bairly wants to stay running along with pooping/backfiring out of both intake and exhaust. When you do rev it up it almost has a stutter when reving, I've tried advancing timing to 14btdc and same thing. I know there's a little screw on throttle body to turn and adjust the idle rpm, as soon as I go below 1000rpm the motor shakes the whole car. I was told when I bought it that it does have a cam, I don't know what but don't think a cam would make it shake like that. Could a mass air flow cause that much trouble? And I replaced the air intake temp sensor I may need to reset codes to see if it fixed it.Any help would be appreciated, thanks

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post #2 of 27 Old 06-02-2019, 10:17 PM
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that is not an idle set screw

do you think you should address the codes, or just call it good and just advance the timing?

since you have not mentioned what this engine is made of, is it safe to assume it is totally stock?

ie the maf, intake, throttle body, maf, injectors, cam??


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post #3 of 27 Old 06-03-2019, 02:20 PM Thread Starter
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Unsure of motor parts I know it's a 95 5.0 HO other than that I don't know,was told it had a cam but you know how that goes. I have replaced the intake air sensor. I'm going to clear codes and check to see if it fixed it next day I'm off

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post #4 of 27 Old 06-03-2019, 02:21 PM Thread Starter
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Injectors,throttle body all looks stock BTW

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post #5 of 27 Old 06-03-2019, 04:45 PM
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sounds like misfiring, multiple cylinders

would recom cylinder rpm drop test, but it wont idle

verify spark firing order and that distrib is in correct position, if it is stock #1 will be labelled on cap

Also it would be wise to ID all parts, or buy known parts

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post #6 of 27 Old 06-03-2019, 04:50 PM Thread Starter
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Can you explain what the little screw is on the left side of the throttle body is that I thought controlled the idle cause it screws down and pushes on the throttle I just assumed that was what it does

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post #7 of 27 Old 06-03-2019, 07:31 PM
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the idle is controlled by the ecm

it uses spark

that screw is set to allow a known precise amount of air by the closed throttle blade

that known value is in the ECM

if you play with it, do you think you can place it back in the correct position?

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post #8 of 27 Old 06-03-2019, 07:52 PM
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Garage
That screw is called the throttle stop.
It’s purpose is to stop the throttle blade when you let off the accelerator.
It’s not for adjusting the idle.*

To me, it sounds like you have the timing incorrect. But you also have a MAF code, so start there.

Is this a new issue after you did some work? Or was it like this when you acquired the car?

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post #9 of 27 Old 06-04-2019, 12:32 AM Thread Starter
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i can try to get that screw back in the right position, Yea im going to test the MAF wensday when im off, and replace if i need too, Been like this ever since i got it. Wife loves Mustangs she seen it and feel in love with the look of it and here i am trying to get it running for her, lol
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post #10 of 27 Old 06-04-2019, 08:57 AM
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I would concentrate on the misfiring, returning the stop can be done later


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post #11 of 27 Old 06-04-2019, 02:08 PM
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I'd make sure the plug wires are in the right location. Start simple.
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post #12 of 27 Old 06-04-2019, 02:43 PM
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like in post#5?

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post #13 of 27 Old 06-04-2019, 09:32 PM
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If the cam was changed, then it is possible that the lifters were incorrectly adjusted or that the cam was not degreed properly.

Has the car run properly while you have owned it?
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post #14 of 27 Old 06-05-2019, 06:04 AM Thread Starter
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No my wife bought it for the looks. If I unplug the MAF while running should the motor cut off or do anything to indicate a bad MAF.

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post #15 of 27 Old 06-05-2019, 09:49 AM
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Originally Posted by forbidance View Post
No my wife bought it for the looks. If I unplug the MAF while running should the motor cut off or do anything to indicate a bad MAF.

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if it is in limp mode, as you say you have a maf code, why would you do an unplug it test?

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post #16 of 27 Old 06-05-2019, 11:11 AM Thread Starter
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I was just asking I was looking at some ways to test the MAF online and some one had a video saying if you unplug the MAF while running it would cause the car to shut off. I was just asking if that was right or what was a way of testing if MAF was bad or is it pretty much if Code says the MAF is bad then its bad?
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post #17 of 27 Old 06-05-2019, 01:44 PM
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you check the signal voltage at the ecm

should be just under 1volt during warm idle

then you snap the throttle and make sure voltage rises accordingly

and a snap to WOT should be near 4 volts

you test at the ecm, to verify circuit integrity from the maf to the ecm

NOTE, very important

>>>>>Codes do NOT mean a part is bad, never.<<<<<

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post #18 of 27 Old 06-05-2019, 01:50 PM Thread Starter
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Thank you so much indy2000 I'll get on that this afternoon

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post #19 of 27 Old 06-05-2019, 06:13 PM Thread Starter
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ok so i got it to running at 14deg btdc and i had to fiddle with the throttle stop screw and the IAC to get it running but it seems to run ok and idle at about 750-800rpm i know i have a MAF Code and Intake Air temp sensor code, I did change the Intake Air temp sensor so im hoping that solved that im fixing to check the MAF. Ill try to upload a video of it running later maybe yall can hear/see something i dont,which im sure you will,lol. Its not pretty not does she run pretty but its got good compression and i want to get her back to looking and running like it should.
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post #20 of 27 Old 06-05-2019, 07:04 PM Thread Starter
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Got a Video. Sorry about the last bit was trying to get Camera to see timing mark but didn't work its at 14deg btdc anyways also a few pic of the Vacuum coming off the intake manifold
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File Type: jpg IMG_20190605_182201.jpg (70.6 KB, 4 views)
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post #21 of 27 Old 06-05-2019, 08:30 PM
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10deg BTDC

you made a video of a timing light?

and no MAF signal!!!

waste of time

you want help!! or not?

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post #22 of 27 Old 06-05-2019, 09:40 PM Thread Starter
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I was trying to make a video more of it running thinking it might help. It doesn't seen to like 10 deg damn near chokes down. If it's a waste of time don't waste your finger muscles typeing... Simple as that. Wouldn't have posted if I didn't want help. Trying to learn here and figure out what's going on. I tried to say thanks for the help in last post and I'm going to get the MAF reading later tonight. Have to wait to next check anyways to get a new MAF if that's what it is.

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post #23 of 27 Old 06-05-2019, 09:51 PM
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Ill decide to post or not

same as you.

I am merely pointing out, that vid offers NO insight to electrons

make a vid of actual voltage measurement.......

the Maf is only the most important sensor,,,,choice is yours.

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post #24 of 27 Old 06-05-2019, 09:54 PM Thread Starter
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I'll would be happy for the help. But the smart ass comments I ain't got time for... I deal with enough smart ass comments at work and I sure ain't going to deal with it here.

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post #25 of 27 Old 06-05-2019, 10:09 PM
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are you threatening me?

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post #26 of 27 Old 06-05-2019, 10:10 PM
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I told you what to measure.....simple

then you make a some idle vid with a timing light

and you say I am smart ass, does that make you a dumb ass?

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post #27 of 27 Old 06-05-2019, 10:25 PM Thread Starter
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Im going to get measurements later tonight if you would have read that. I made the video just for the sound to see if anyone heard anything out of the ordinary I hadnt. The timing crap was just to see if it would pickup and it didn't .Anyways Mods can close this thread now if they would like I am done posting here thanks for the help everyone.

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