why is my 2003 tacoma idle high and slack in throttle line, after I replaced the throttle body?

280

Asked by Jul 13, 2013 at 07:17 PM about the 2003 Toyota Tacoma

Question type: Maintenance & Repair

42 Answers

....well high idle can be attributed to the vacuum hose removed at the pressure regulator~ should have taken pictures because you missed a clamp...perhaps holdin' her steady capn' for the entry to the business end...this one still has a cable? thought they were all drive-by-wire anymore at this point in automotive history~

4 out of 4 people think this is helpful.
280

No vacuum leaks. Its doing the same thing it was doing before I put the new throttle body on. When I disconnect a battery cable and reconnect, it runs fine, with no play in throttle. But when I shut the engine off and restart, it idles high and play/slack is back in the throttle. Please help!!!

10 out of 10 people think this is helpful.

does this one have a 'thermo-time switch?'....will investigate~

1 out of 1 people think this is helpful.

okay no...I guess...robot keeps coming up with temperature sensor as it's solution...do we believe the friendly robot?

1 out of 1 people think this is helpful.

the ambient air conditions tell the ECU how much to enrich the air/fuel mix...perhaps this device is not working properly~

1 out of 1 people think this is helpful.

I trust you got the slack out by putting the bushings in there out of the kit if there was one or clamping correctly in the right spots?

280

No sir, the slack is in the new throttle body. All of them have it. Someone mentioned that it has to relearn. I've tried everything. Do you think a sensor is bad?

1 out of 1 people think this is helpful.
280

Photo

5 out of 5 people think this is helpful.
280

Photo

1 out of 1 people think this is helpful.
101,725

Faulty throttle position sensor could cause this type of issue. Also appears in your picture that you might have a vacuum line missing.

2 out of 2 people think this is helpful.
280

The TPS came on the new throttle body. Which vacuum line is missing?

the somewhat larger vacuum hose coming out of the filter box is cracked at the exit of the filter box...replace cracked butyl rubber with silicone---not quite sure which line dandyoun things isn't there....aside from the visibly cracked butyl rubber hose am going to have to study the pic...

hey....there is an adjustment right there to take out the slack~

2 out of 2 people think this is helpful.
280

I will replace the hose and continue to search for a soloution to the high idle and slack in throttle.

the exit barrel the tps is activated has a screw thread for taking out any extra play....did you not see that one?

280

No sir.

okay in your first "photo' the adjustment looks cheesed off, in your second photo it looks like there is at least ten MM of adjustment...is there no adjustment and the cable looks ragged like in the first Photo?

1 out of 1 people think this is helpful.
280

Hey Judge, the slack is in the throttle on the throttle body, not the cable. When I reset by disconnecting the battery cable and reconnecting, the slack goes away, and everything operates fine. But when I shut the vehicle off and restart it, it idles high and slack is back in the throttle. When this happens, the vehicle changes out rought.

there isn't a rotary adjustment on that TPS?...you sure?

280

I'll send you a photo of the TPS.

1 out of 1 people think this is helpful.
280

This is the top of the TPS.

1 out of 1 people think this is helpful.
280

Photo 2

1 out of 1 people think this is helpful.

looks like your ears are in a fixed position...some have crescent slots that allow you to zone in on the correct location....do you have the correct replacement unit?

1 out of 1 people think this is helpful.
280

This is just like my TBS.

1 out of 1 people think this is helpful.

guess you know what needs to be done now~

280

What's the process? Loosen both screws and rotate clockwise? Please give me step by step.

2 out of 2 people think this is helpful.
280

I imagine you are sleepy, therefore, tomorrow will be fine.

1 out of 1 people think this is helpful.

well perhaps with the motor running, loosen till still gripping slightly, then rotate until it "feels right"...I mean I could do some research to find voltages and amperages and such, but would need to study the schematic...it is actually a beautiful night here in Clearlake...today got over 95 degrees but a big L is takin' over and I'm enjoying every minute of it~...makes me want to make another pot of coffee---~

bet it's going to be the point at which it starts to affect the cable...that would be the "sweet spot"~ goodnight my friend~

someone put yellow 'caution' paint on that...so you could put it back the way it was? there has to be a good reason....

hell with their paint...it has to be tuned properly~

280

Thank you, Judge_Roy!!! I will give you an update tomorrow evening.

to ask your prior inquiry about the vacuum line, I was talking about your fuel pressure regulator that if the line gets cracked or falls off the engine will be pullin' vacuum and not letting full flow of gasoline...a one two punch and will not be detected by your onboard diagnostics OBD-II~

280

After I make the adjustments, does the system need to relearn?

You know I've never had any system ask to have space to "relearn" the sensors are there...the parameters are all preset...really not sure of where this "relearn" business came from...I mean if you are swapping out ECU units for example may take some time to learn the new parameters but honestly, turn the tps until you are comfortable with it (probably JUST out of the slack that may be there) and cinch it down~ if it is not running right...we will have to consult the OBD-II diagnostics then~

....speaking of idle speed, you've got an idle air control valve that may or may not be actin' right~

280

Well Judge, no luck. Doing the same damn thing!!! This is a brand new throttle body.

1 out of 1 people think this is helpful.

THE IAC (idle air control) is messin' up~....noted above, perhaps you could get a cheap second from pickNpull~

1 out of 1 people think this is helpful.
280

Where is it located on the vehicle?

3 out of 3 people think this is helpful.

It has been a pleasure workin' with you jtubbs, all I can say is we climbed through the planes of hell together...hopefully the IAC will make it all worthwhile~

will find a cartoon~

okay slapped to the bottom of your throttle body~

Your Answer

Add photo

Related Questions

Tacoma

Looking for a Used Tacoma in your area?

CarGurus has 33,560 nationwide Tacoma listings starting at $2,988.

ZIP:

Search Toyota Tacoma Questions

Toyota Tacoma Experts

#1 Tom Demyan
Tom Demyan
Reputation 860
#1 FordNut
FordNut
Reputation 860
#3 genxer36
genxer36
Reputation 310
View All

Related Models For Sale

Used Toyota Tundra
683 Great Deals out of 28,313 listings starting at $2,500
Used Nissan Frontier
445 Great Deals out of 21,886 listings starting at $2,350
Used Ford F-150
3,395 Great Deals out of 205,480 listings starting at $1,273
Used Toyota 4Runner
388 Great Deals out of 20,275 listings starting at $2,995
Used Chevrolet Silverado 1500
2,677 Great Deals out of 149,054 listings starting at $1,800
Used Chevrolet Colorado
338 Great Deals out of 16,985 listings starting at $2,195
Used Ford Ranger
223 Great Deals out of 6,940 listings starting at $1,500
Used GMC Sierra 1500
1,162 Great Deals out of 58,047 listings starting at $2,495
Used Jeep Wrangler
505 Great Deals out of 17,416 listings starting at $2,990
Used Dodge Ram 1500
529 Great Deals out of 12,950 listings starting at $1,800
Used Nissan Titan
239 Great Deals out of 14,474 listings starting at $4,200
Used GMC Canyon
155 Great Deals out of 8,316 listings starting at $3,500
Used Toyota Corolla
1,406 Great Deals out of 68,394 listings starting at $988
Used Toyota Camry
1,492 Great Deals out of 100,431 listings starting at $700

Used Cars For Sale

2017 Toyota Tacoma For Sale
14,683 listings starting at $21,384
2016 Toyota Tacoma For Sale
66 Great Deals out of 2,488 listings starting at $20,980
2015 Toyota Tacoma For Sale
129 Great Deals out of 2,765 listings starting at $17,333
2014 Toyota Tacoma For Sale
92 Great Deals out of 2,192 listings starting at $11,990
2013 Toyota Tacoma For Sale
106 Great Deals out of 2,394 listings starting at $7,995