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Author
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Topic: Mustang dies when I come to a stop!
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86xchpstang
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Member # 11800
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posted
 
 
So I have a 1986 mustang coupe with a 92 motor. It has hci full exhaust, long tube headers, 47lb injectors, 320lph fuel pump and a tune for all this. So sometimes when I'm driving and come to a stop light/sign the car acts like it wants to die and I have to give it a Lil gas to keep it going! It kinda sometimes did this b4 the injectors fuel pump and intake mani. But after I got all that installed it seems like it wants to die everytime I come to a stop if I don't give it some gas to keep her going!!
Any help or advise would rely help. I also have under drive pulleys ( alt, h20 pump, crank ). I'm wondering if the alt pulley has to do anything with this or maybe my tps sensor is going bad or even my idle air controll motor?!?!?
Posts: 93 | From: california | Registered: Mar 2012
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nitrous_bob
CAFords OG
Member # 77
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posted
nope...probably none of that
idleing issues/surging idle are usually VAC related
i'd spend some time looking at ALL of it, not just what you can see....but the tree under the intake, the canister....ALL of it
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5.0 OG since 1990
Posts: 1402 | From: st clair shores MI | Registered: Nov 2000
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86xchpstang
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Member # 11800
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posted
So what would I be looking for??? Leaks in vac lines??
Posts: 93 | From: california | Registered: Mar 2012
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86xchpstang
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Member # 11800
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posted
Or what about my map sensor??
Posts: 93 | From: california | Registered: Mar 2012
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triple b
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Member # 8763
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posted
igntion switch on the steering column the one thAt the tumber spins the rod/shaft into the plastic switch....it needs to be ziptied tight against the contacts100% thats ur problem i bet it even wants to shut off on thefreeway also or everytime u brake hard map sensor or vac lines u see a check engine light or hear hissing
[ July 09, 2012, 12:33 AM: Message edited by: triple b ]
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1988 4cyl conv 306 HCI "sasha"
2004 tahoe
Sold- 87 GT, 72 chevelle, 63 biscane, 82 monte carlo, 73 nova, 88 silverado,
Posts: 1730 | From: sacramento ca | Registered: Nov 2008
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86xchpstang
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Member # 11800
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posted
I've already replaced the hole steering colum becuz I already had that problem. And no I do not hear any hissing or anything like that! Do u think it's getting to much gas with the 340lph fuel pump and the 47's and it being n/a??? It's not running Rich or anything becuz it's tuned!!
Posts: 93 | From: california | Registered: Mar 2012
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SLOWSN95
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Member # 8269
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posted
quote:
Originally posted by 86xchpstang:
I've already replaced the hole steering colum becuz I already had that problem. And no I do not hear any hissing or anything like that! Do u think it's getting to much gas with the 340lph fuel pump and the 47's and it being n/a??? It's not running Rich or anything becuz it's tuned!!
How would it be getting too much fuel but not run rich?
Don't think too hard.. the problem is probably right under your nose
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94' GT
347 Stroker
MM Suspended
2003 SB SVT Lightning
Pullied and Lowered
89'Hatch-SOLD
Posts: 2214 | From: 510/east bay | Registered: Mar 2008
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just_another_ 91
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Member # 9317
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posted
possibly could be your tps voltage do you have a check engine light
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R.I.P 91 Black LX: 13.45@102.62
Posts: 206 | From: CA | Registered: Jul 2009
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nitrous_bob
CAFords OG
Member # 77
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posted
your extra fuel returns, so no
i doubt TPS, but check it anyways
yes, look for brittle lines, cracked lines...you wont always hear a line, you need to physically run your fingers over every inch. the trees too, at the firewall , and under the intake
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5.0 OG since 1990
Posts: 1402 | From: st clair shores MI | Registered: Nov 2000
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triple b
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Member # 8763
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posted
it could be idle air un ug it and see if it drive the same some time tapping or cleaning it could be pluged fuel filter does the psi stay steady when u drive
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1988 4cyl conv 306 HCI "sasha"
2004 tahoe
Sold- 87 GT, 72 chevelle, 63 biscane, 82 monte carlo, 73 nova, 88 silverado,
Posts: 1730 | From: sacramento ca | Registered: Nov 2008
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Tony Montana
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Member # 8288
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I had the same problem on my 50 turned out being a bad ground wire. Check the wire on the back of your engine block and the one going to the block from your battery. Seemed funny to me easiest fix that i tryed last.
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I lend my brother a hand cus i know i can i keep going and going but i aint the pink bunny instead of beatin on a drum i never stop gettting money
Posts: 369 | From: Oakland California | Registered: Mar 2008
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86xchpstang
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Member # 11800
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posted
No check engines lights at all.
Posts: 93 | From: california | Registered: Mar 2012
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86xchpstang
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Member # 11800
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posted
I dunno what the fuel pressure is while I'm driving. I don't have a fuel pressure regulator!! Um how would I check the tps voltage and what is it supposed to be at??? I'm actually thinking it might be the ground on the engine block. Becuz sometimes after I shut the car off even just for a minute it won't/doesn't start back up! And sometime I'll have to get it jumped just so it'll start!! Where is the ground wire from the chassi to the engine??
Posts: 93 | From: california | Registered: Mar 2012
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Blind
2.3L
CAFords OG
Member # 3052
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posted
does your speedometer work? the VSS in the trans that the speedo cable plugs into, if not hooked up will cause it to stale when rolling up to a stop.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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86xchpstang
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Member # 11800
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posted
No its not hooked up to the speedo! But it is connected to the trans. I can't get it to plug in to the back of the dash. It's like it's to short or something
Posts: 93 | From: california | Registered: Mar 2012
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Tony Montana
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Member # 8288
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The ground wire is on the back of the motor. Mine had all these same symptoms and it was the main ground wire from the battery. It would crank slow then hella fast with a jumpstart. After i changed ground cable it worked like a champ all the time.
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I lend my brother a hand cus i know i can i keep going and going but i aint the pink bunny instead of beatin on a drum i never stop gettting money
Posts: 369 | From: Oakland California | Registered: Mar 2008
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86xchpstang
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Member # 11800
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Well the ground wire is brand new almost on the battery. I have a battery relocation box in the trunk. So either it's not grounded good or it's the 1 on the engine block
Posts: 93 | From: california | Registered: Mar 2012
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triple b
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Member # 8763
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not hooked up lol they are all short on everyones foxbody sounds to me like u just looking for easy fix and everything is half ass on ur car ![[Wink]](wink.gif) just my two cents start connecting everything 100% u might not have so many problems
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1988 4cyl conv 306 HCI "sasha"
2004 tahoe
Sold- 87 GT, 72 chevelle, 63 biscane, 82 monte carlo, 73 nova, 88 silverado,
Posts: 1730 | From: sacramento ca | Registered: Nov 2008
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86xchpstang
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Member # 11800
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posted
No everything is hooked up just fine on the car!! I don't do nor do I like nigger rigged shit. This car is my 2nd wife so I take real good car of it!! I'm not looking for a easy fix I would like to fix it for good so I don't keep having this problem. But yes the speedo cable is not hooked up, u r right on that 1. I will hook it up today and check all of the ground wires.
Posts: 93 | From: california | Registered: Mar 2012
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Blind
2.3L
CAFords OG
Member # 3052
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posted
for a trunk mounted battery the best ground to use is to run a 0/1 awg cable out of the trunk floor and attach it to one of the quadshock mounting bracket bolts on the rear frame rail, make sure to use a wire brush or grinder to scuff up the area where the cable will be touching to get good contact as well.
and when running a trunk mount battery, you'll also want to add a 4awg ground wire from the engine to one of the front swaybar bracket mounting bolts because the dinky little 16awg ground wire on the wiring harness is not enough once the battery ground wire has been removed.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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BLoWN FR500
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Member # 8766
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posted
TPS... COULD JUST BE IT. I HAD THAT SAME PROBLEM EVEN AFTER I TUYNED MY CAR. TRY CHANGING IT AND ALSO THE (AIC) GOODLUCK
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92 Fobra Supercharged - Stolen
89 Turbod Fobra - Sold
90 Lx - Sold
86 Lx - Sold
96 Cobra
I Stay Charged Like The Energizer Bunny
Posts: 1226 | From: San Leandro | Registered: Nov 2008
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BLoWN FR500
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Member # 8766
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posted
CHECK YOUR ECU AS WELL!
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92 Fobra Supercharged - Stolen
89 Turbod Fobra - Sold
90 Lx - Sold
86 Lx - Sold
96 Cobra
I Stay Charged Like The Energizer Bunny
Posts: 1226 | From: San Leandro | Registered: Nov 2008
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86xchpstang
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Member # 11800
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posted
Whats the AIC???
Posts: 93 | From: california | Registered: Mar 2012
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86xchpstang
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Member # 11800
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posted
I do have a 4awg wire grounding under the hood. I did however notice that it's grounded from the ps pump to the shock Pertch but it doesn't look like it was sanded or wire brushed so I'll try to get bare metal to show and hook it back up
Posts: 93 | From: california | Registered: Mar 2012
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86xchpstang
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Member # 11800
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posted
Or did u mean iac?
Posts: 93 | From: california | Registered: Mar 2012
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