Engine troubles

purple95stang · 02-13-2003, 10:11 AM

I'm having a surge problem at startup. Sometimes when cranked the car idles fine at other times it will idle real low to the point that sometimes it just dies. It did this last night only it would start and then try to die but if I gave it gas it wouldn't take it and started making popping noises under the hood like a backfire. When I let off of the gas it would die. It kept doing this until I let it set there for about 10 minutes and then it started fine and ran fine. I need to have it looked at today but don't have a clue as to what it could be. I don't want a mechanic telling me I need everything under the sun that I don't really need. BTW it is a 95 GT with flowmasters and silencer removed.

cyberstang5.0 · 02-13-2003, 10:50 AM

Sounds like it's a vacume problem. Spray some brake cleaner in certin parts of your enige (while it's running) and when the idle goes up, that's the part that it's leaking at.

Also, check your TPS.

Maroon 5.0 LX · 02-13-2003, 11:05 AM

Quote:

Originally posted by cyberstang5.0
Sounds like it's a vacume problem. Spray some brake cleaner in certin parts of your enige (while it's running) and when the idle goes up, that's the part that it's leaking at.
Also, check your TPS.

Do you mean ON the engine? I wouldn't spray it IN the engine.
*******************

purple95stang

First thing is to check for any codes. If none present, I would first run a check on the TPS, Throttle Position Sensor as per the shop manual.

cyberstang5.0 · 02-13-2003, 12:53 PM

I ment IN certin areas.... or on the engine parts themselves.

What I was trying to get at is don't just radomly spray the entire engine, you won't know exactly where the leak it. It might help if you put that stupid little straw on the end (I can never get it to work right). Spray the TB, then underneath the upper intake, then where the lower intake meets the heads, etc....

ChunkFunky · 02-13-2003, 12:57 PM

I think the basic concept is.. if there's a vacum leak somewhere it'll suck up the brake clean which is flamable, so the idle will surge a bit..... though if it's a big enough leak you'll hear it... so if you spray certain strategic areas you'll be able to find the general area of the leak and then find it and plug it... it may not be a leak at allo, but for the 25 cents worth of brake clean, it's a good start
-as

Maroon 5.0 LX · 02-13-2003, 03:37 PM

Quote:

Originally posted by cyberstang5.0
I ment IN certin areas.... or on the engine parts themselves. What I was trying to get at is don't just radomly spray the entire engine, you won't know exactly where the leak it. It might help if you put that stupid little straw on the end (I can never get it to work right). Spray the TB, then underneath the upper intake, then where the lower intake meets the heads, etc....

I knew what your were trying to say. I just don't want someone with little knowledge squirting that brake cleaner in the throttle body and messing something up.

cyberstang5.0 · 02-13-2003, 05:02 PM

Gotcha

horsesnake95 · 02-15-2003, 04:21 AM

Just out of curiousity, has any work been done to the car lately motor wise.....? If anything has been done that would be the area i would look at first...... Just my 5 cents though.

purple95stang · 02-15-2003, 04:32 AM

No work has been done to car. The surging idle at startup has been happening for about a month and is slowly getting worse to where it doesn't want to run.

Old Guy with 87 GT · 02-15-2003, 07:14 AM

could be that the iac is sticking (idle air control )........try removing it and cleaning it out with a fuel injection safe ,throttle body cleaner ......see if that helps

i'd also try checking the temp sencors ,they play a big role when starting ,the computer has to know the temp of the moter to select ther right tune for start up ,if one of these sencors is bad ...it'll throw the computer off at start up

JaxTheDJ · 02-15-2003, 07:16 AM

I read an article in another forum on rolling idle,they reccomend that you pull apart the grey and white harness connectors and use contact cleaner on them and reinstall with a good dielectric gease,you also may want to check the other connectors in this manner,a bad connection will also cause idle surge.

Z28EATR · 02-19-2003, 06:19 PM

my mom had a 95 gt that was doing the same thing you would start it up and it would idle really low and die sometimes if you try to give it gas it would pop and crack like rice cripies. i changed plugs wires cap rotor, fuel filter, cleaned iac, cleaned o2's turned out the mass air sensor went out, imagine the look on my face when i unplugged the sensor while it was running and it didnt make any difference in idle, problem cured with new sensor. my 2 cents.

bircky311 · 02-21-2003, 05:20 AM

I'm with Z28eater. in my experience, it really sounds like a MAF. I'm not real sure about the 95 mustang computer, but most others kinda revert to Speed Density with the MAF unpluged. Give it a try... (my 1/4 cent... I'm not worth 2)

bigred90gt · 02-21-2003, 09:49 AM

I had a similar problem and it turned out being the pickup coil. Just a thought.

Caymon

02-13-2003, 10:11 AM	#1
purple95stang Registered Member Join Date: Feb 2003 Location: Auburn,Ga. Posts: 2	Engine troubles I'm having a surge problem at startup. Sometimes when cranked the car idles fine at other times it will idle real low to the point that sometimes it just dies. It did this last night only it would start and then try to die but if I gave it gas it wouldn't take it and started making popping noises under the hood like a backfire. When I let off of the gas it would die. It kept doing this until I let it set there for about 10 minutes and then it started fine and ran fine. I need to have it looked at today but don't have a clue as to what it could be. I don't want a mechanic telling me I need everything under the sun that I don't really need. BTW it is a 95 GT with flowmasters and silencer removed.

02-13-2003, 12:57 PM	#5
ChunkFunky Registered Member Join Date: Apr 2002 Location: Tustin, CA Posts: 465	I think the basic concept is.. if there's a vacum leak somewhere it'll suck up the brake clean which is flamable, so the idle will surge a bit..... though if it's a big enough leak you'll hear it... so if you spray certain strategic areas you'll be able to find the general area of the leak and then find it and plug it... it may not be a leak at allo, but for the 25 cents worth of brake clean, it's a good start -as __________________ '89 GT Convertible: TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit

02-15-2003, 07:14 AM	#10
Old Guy with 87 GT Registered Member Join Date: May 2001 Location: Harrisburg, Pennsylvania Posts: 379	could be that the iac is sticking (idle air control )........try removing it and cleaning it out with a fuel injection safe ,throttle body cleaner ......see if that helps i'd also try checking the temp sencors ,they play a big role when starting ,the computer has to know the temp of the moter to select ther right tune for start up ,if one of these sencors is bad ...it'll throw the computer off at start up __________________ the "not so old",old guy 87 Mustang GT T-top >hanlon t-5, pro 5.0, centerforce clutch ,adj. cable/quatrant ,3.27s ,full 2 1/2 ex(off road H) adj. reg. ,e-cam ,70mm TB, cobra intake ,1.7rr ,ported/milled e7ets w/crane springs ,306 balaced/decked short block w/speed pro forged flat top pistons ...257rwhp/302rwt best et 13.7@102 (4/11 ) '80 Capri (future project,currently collecting parts for 351 moter)

02-15-2003, 07:16 AM	#11
JaxTheDJ Registered Member Join Date: Aug 2002 Location: Jacksonville,Fla. Posts: 134	I read an article in another forum on rolling idle,they reccomend that you pull apart the grey and white harness connectors and use contact cleaner on them and reinstall with a good dielectric gease,you also may want to check the other connectors in this manner,a bad connection will also cause idle surge. __________________ Jack 1989 Mustang LX: Converted to Carb.650 AED Holley DP,Weiand Stealth Intake,Edelbrock Performer RPM Aluminum Heads,Hooker Super Comps, Ground Pounder Uppers and Lowers,Moroso Drag Springs,NEW COMP Xtreme Energy Cam and 1.6 RR. ,a few other goodies.*** New 1/4 times-12.50 1987 SC GT ( fast as hell) 2001 Powerstroke Tow Vehicle 1989 Coupe. Sometimes when you cry,no one sees your tears.......... Sometimes when you are happy,no one sees your smile......... But,FART just ONE time..........

02-19-2003, 06:19 PM	#12
Z28EATR Registered Member Join Date: Jun 2000 Location: Florence, KY,USA Posts: 210	same thing my mom had a 95 gt that was doing the same thing you would start it up and it would idle really low and die sometimes if you try to give it gas it would pop and crack like rice cripies. i changed plugs wires cap rotor, fuel filter, cleaned iac, cleaned o2's turned out the mass air sensor went out, imagine the look on my face when i unplugged the sensor while it was running and it didnt make any difference in idle, problem cured with new sensor. my 2 cents. __________________ 88 LX 5.0 Ragtop "Desire" 14.18 @ 99.65 mph Best 60ft 2.19 YUK!!!! Best Mph 98.9 Slicks 13.86 @ 97.9 mph 60ft 1.93 yeah!!! Mod Specs

02-13-2003, 10:50 AM	#2
cyberstang5.0 347ci of HORSE POWER!!! Join Date: Jul 2001 Location: Houston, TX Posts: 1,416	Sounds like it's a vacume problem. Spray some brake cleaner in certin parts of your enige (while it's running) and when the idle goes up, that's the part that it's leaking at. Also, check your TPS.

02-13-2003, 12:53 PM	#4
cyberstang5.0 347ci of HORSE POWER!!! Join Date: Jul 2001 Location: Houston, TX Posts: 1,416	I ment IN certin areas.... or on the engine parts themselves. What I was trying to get at is don't just radomly spray the entire engine, you won't know exactly where the leak it. It might help if you put that stupid little straw on the end (I can never get it to work right). Spray the TB, then underneath the upper intake, then where the lower intake meets the heads, etc....

02-13-2003, 05:02 PM	#7
cyberstang5.0 347ci of HORSE POWER!!! Join Date: Jul 2001 Location: Houston, TX Posts: 1,416	Gotcha

02-15-2003, 04:21 AM	#8
horsesnake95 Registered Member Join Date: Oct 2002 Location: illinois Posts: 26	Just out of curiousity, has any work been done to the car lately motor wise.....? If anything has been done that would be the area i would look at first...... Just my 5 cents though.

02-15-2003, 04:32 AM	#9
purple95stang Registered Member Join Date: Feb 2003 Location: Auburn,Ga. Posts: 2	No work has been done to car. The surging idle at startup has been happening for about a month and is slowly getting worse to where it doesn't want to run.

02-21-2003, 05:20 AM	#13
bircky311 Registered Member Join Date: Feb 2003 Location: Butler, PA Posts: 19	I'm with Z28eater. in my experience, it really sounds like a MAF. I'm not real sure about the 95 mustang computer, but most others kinda revert to Speed Density with the MAF unpluged. Give it a try... (my 1/4 cent... I'm not worth 2) __________________ '89 Grand Marquis. Soon to have HO conversion and 3.27s on a trac lok diff "Hot rodding a Grand Marquis is a little like making bourbon out of Geritol." said by John Phillips about the Mercury Marauder. Car and Driver, July 2002.

02-21-2003, 09:49 AM	#14
bigred90gt 2 Stangs in the Stable Join Date: Apr 2002 Location: Baytown, TX Posts: 1,209	I had a similar problem and it turned out being the pickup coil. Just a thought. Caymon __________________ '90 GT Under construction Best E.T. = Fast @ High Speeds - OK So I Lie. So What!!! 04 F-150 STX 4.2L 5 spd Rice Haters Club Member #128

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