jerking at low RPMS...

Blandnuts · May 16, 2005

Don't go and buy new parts, find the problem first.

1. Clean the IAB or IAC (the valve everyone is talking about). Take it off the car and spray carb cleaner or something similar into it. Just make sure the plunger can move freely without sticking.

2. TPS- Check this with the key on engine off. Get a volt meter and plug into the black and the green or orange (can't remember off the top of my head so do a search). Anyways, you'll know when you're on the right wire... The voltage should be within .9 to .99 volts. If it's not then you'll have to loosen the two screws on top and adjust it to the proper range.

3. I'd also check for vacuum leaks.

Might want to go ahead and do a tune up since it seems like the car needs it. Good luck.

Fred

88_GT_5_oh · May 16, 2005

Blandnuts said:
Don't go and buy new parts, find the problem first.

1. Clean the IAB or IAC (the valve everyone is talking about). Take it off the car and spray carb cleaner or something similar into it. Just make sure the plunger can move freely without sticking.

2. TPS- Check this with the key on engine off. Get a volt meter and plug into the black and the green or orange (can't remember off the top of my head so do a search). Anyways, you'll know when you're on the right wire... The voltage should be within .9 to .99 volts. If it's not then you'll have to loosen the two screws on top and adjust it to the proper range.

3. I'd also check for vacuum leaks.

Might want to go ahead and do a tune up since it seems like the car needs it. Good luck.

Fred

green wire on the TPS to the red wire on the voltmeter, and the black wire on the volt meter to ground.

.98 seems to work good for me

genericstang · May 16, 2005

ok, i will try those things probably weds(my next day off)

also i went out again tonight for like a small drive(about 10miles total) and when i stopped and got out, there was light smoke coming from what seemed to be the cats. which kinda confused me. also smoke was coming up from the firewall area. didnt see anything burning or whatever. i drove around some more and it stopped? weird.

ive already did the spark plugs, wires, cap and rotor, and air filter.

88_GT_5_oh · May 16, 2005

something might have fell on an exhaust part when you were working... 9 times outta 10 i spill oil on my headers when i put oil in, i have a shakey hand i guess.... it smokes pretty good

genericstang · May 18, 2005

ok, i changed the air filter and put in a new PCV valve. the problem still occurs.

-idle still flucuates between 500-1K
-jerks in gears 1-4 around 2K RPM when decellerating(not on the throttle)

i dont know if its vacuum leaks, but ill check and see when i go back outside.

also, while checking the TPS, i just adjust it until its right, or would i need to just replace it completely?

lastly, if those things dont work, ill replace the idle air control valve.

any other suggestions before i take it to a shop?

genericstang · May 18, 2005

EDIT// found a vacuum leak on a hose that is connected on the firewall. im looking through my haynes manual right now, but am having trouble finding what tube it is etc etc. can anyone help me out here on what tube it is, how long, width, etc. as always, thanks for your continued help!

View attachment 514345

Blandnuts · May 18, 2005

genericstang said:
also, while checking the TPS, i just adjust it until its right, or would i need to just replace it completely?

lastly, if those things dont work, ill replace the idle air control valve.

any other suggestions before i take it to a shop?

Do a complete tune up. Wires, plugs, cap, rotor and fuel filter.

TPS- Just check it before you loosen the two screws. If it's not within specs, loosen the screws and try to get the proper volts. If you can't get it, you might have to take it off the car and widen the holes, but be careful you don't take too much off.

Clean the valve before you buy a new one. They are prone for getting dirty....

Fred

Blandnuts · May 18, 2005

Your best bet is to follow the tube and match it up with a new one. I'd also check the other lines for future problems and fix them all at once. Good luck

Fred

genericstang · May 18, 2005

ive already done tune up stuff within the past 3 months.

New Plugs
New Wires
New Cap and Rotor
Oil Changed
New Air Filter (finally put in today)
New PCV (just did today)

ill do the fuel filter next. probably sometime next week perhaps.

right now im heading back to the store to get some hoses to replace the one with a leak. hopefully this will fix the problems, if not, then ill try the TPS.

THANKS!!

jbj454 · May 18, 2005

Looks like your pointing at the main vaccuum line that runs to the upper intake. I think its a 3/8", no longer than 10-12". Cut extra length to be for certain and trim any extra. My buddies car was doing the same thing with the idle, and he changed his o2 sensors and that fixed the problem. Hope this helps.

genericstang · May 18, 2005

jbj454 said:
Looks like your pointing at the main vaccuum line that runs to the upper intake. I think its a 3/8", no longer than 10-12". Cut extra length to be for certain and trim any extra. My buddies car was doing the same thing with the idle, and he changed his o2 sensors and that fixed the problem. Hope this helps.

i didnt feel like finding the other end of the hose so...i just cut it wear the leak was(since the hose was in pretty good condition) and put a connect there. and then cut a piece of new hose and connected it from the other end of the connector to the module. runs like "new" again.

ill probably still change the fuel filter next week.

THANKS!! everyone for your help on getting another 5.0 brother out of mud.

Blandnuts · May 18, 2005

I suggest replacing the line when you get a chance. I know I hate doing things twice.

Fred

mrswivlepants · May 18, 2005

Did you pull the codes yet? Don't start buying stuff from suggestions from these internet mechanics. Although these are all educated guesses, they haven't looked at your car. I had the same problem and pulled the codes. Got both codes for my O2 sensors. As soon as I replaced them it was like driving a new car. BUT, don't buy O2 sensors. Pull the friggin codes.

50gt1988 · May 18, 2005

mrswivlepants said:
Did you pull the codes yet? Don't start buying stuff from suggestions from these internet mechanics. Although these are all educated guesses, they haven't looked at your car. I had the same problem and pulled the codes. Got both codes for my O2 sensors. As soon as I replaced them it was like driving a new car. BUT, don't buy O2 sensors. Pull the friggin codes.

First lets not start throwing around the term "internet mechanics." I can't speak for anyone else but personally I don't give advice unless I've fixed a similiar problem.
And by the way that hose that you repaired connects to a main vaccum port underneath the upper intake, its used on the Speed Density system to measure Manifold Air Pressure (MAP), very important!

Blandnuts · May 18, 2005

mrswivlepants said:
Did you pull the codes yet? Don't start buying stuff from suggestions from these internet mechanics. Although these are all educated guesses, they haven't looked at your car. I had the same problem and pulled the codes. Got both codes for my O2 sensors. As soon as I replaced them it was like driving a new car. BUT, don't buy O2 sensors. Pull the friggin codes.

Internet mechanics.... Do I win something?

Edit: Did you have a check engine light on when the O2 sensors went bad?

90mustangGT · May 18, 2005

Genericstang I live/work in your area.... Why don't you just PM me or Email me when you have issues. Then we will post the cause/fix of your problem later. I figure you don't want to bother me but it's no bother. If you really love your car then I don't mind helping out.

genericstang · May 18, 2005

90mustangGT said:
Genericstang I live/work in your area.... Why don't you just PM me or Email me when you have issues. Then we will post the cause/fix of your problem later. I figure you don't want to bother me but it's no bother. If you really love your car then I don't mind helping out.

you disappeared from here awhile back and i didnt know what happend. lol. anyways, im going to PM you because i have some questions about parts etc. thanks again.

(internet mechanics are my HEROS )

mrswivlepants · May 18, 2005

50gt1988 said:
First lets not start throwing around the term "internet mechanics." I can't speak for anyone else but personally I don't give advice unless I've fixed a similiar problem.

Don't get your internet panties in an internet bunch about this. I reinforced the best advice I've seen in this thread as of yet, given first by 89lxsport50. I gave you all Kudos when I said educated guesses. If he hasn't pulled the codes, all you're doing is encouraging people to go out and throw money right down the crapper until they stumble upon the solution.

Blandnuts said:
Edit: Did you have a check engine light on when the O2 sensors went bad?

Oddly enough, I had never seen a check engine light on but I ran the codes anyway. The strange part was that I got a check engine a few weeks after replacing the O2's....turns out my egr was flaking around the same time and that tripped the light. I thought the damned check engine light was a myth when my car started running like crap.

jerking at low RPMS...

Blandnuts

I don't swallow; I only swoosh

88_GT_5_oh

Sportin' a turbo 5.0 in Canadistan

genericstang

New Member

88_GT_5_oh

Sportin' a turbo 5.0 in Canadistan

genericstang

New Member

genericstang

New Member

Blandnuts

I don't swallow; I only swoosh

Blandnuts

I don't swallow; I only swoosh

genericstang

New Member

jbj454

New Member

genericstang

New Member

Blandnuts

I don't swallow; I only swoosh

mrswivlepants

New Member

50gt1988

New Member

Blandnuts

I don't swallow; I only swoosh

90mustangGT

I felt sorry for girls because

genericstang

New Member

mrswivlepants

New Member

Similar threads

jerking at low RPMS...

I don't swallow; I only swoosh

Sportin' a turbo 5.0 in Canadistan

New Member

Sportin' a turbo 5.0 in Canadistan

New Member

New Member

I don't swallow; I only swoosh

I don't swallow; I only swoosh

New Member

New Member

New Member

I don't swallow; I only swoosh

New Member

New Member

I don't swallow; I only swoosh

I felt sorry for girls because

New Member

New Member

Similar threads

Privacy & Transparency

Privacy & Transparency