Toyota

Have Toyota Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

1997 Tacoma 2.7L looses power on hills after warming up.

Customer Question
1997 Tacoma 2.7L looses...

1997 Tacoma 2.7L looses power on hills after warming up. usually after setting for 5-10 minuets.

Mechanic's Assistant: Are you fixing your Tacoma yourself? What have you tried so far?

Replaced the following: distributer cap, plugs, plug wires, temperature sensor, thermostat, cleaned throttle body, cleaned MAF, air filter is good, cat is like new, replaced any vacuum lines that were cracked.

Mechanic's Assistant: Have you checked the connectors on the sensor itself? It's important that they not be loose or corroded.

They look clea and are not loose.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

It seemed like it started with issue sometime after replacing the exhaust manifold gaskets (2 donuts at exhaust pipe) It does sound like there may be an exhaust leak at manifold.

Submitted: 8 months ago.Category: Toyota
Show More
Show Less
Ask Your Own Toyota Question
Answered in 9 minutes by:
9/20/2017
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago
Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 4,629
Experience: Toyota Master Tech, ASE Certified
Verified

Thanks for posting

Is the check engine light staying on? Are there any diagnostic trouble codes?

Ask Your Own Toyota Question
Customer reply replied 8 months ago
No check engine lights. No one has been able to connect with code reader or scanners.
Customer reply replied 8 months ago
I am thinking that the engine has been swapped out sometime because there are several wiring harness plugs in engine bay and one by the transmission that have no where to connect them. A different engine could explain why a code reader wont connect.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

Possibly yes, does the check engine light even turn on when the key is on before starting the engine?

Ask Your Own Toyota Question
Customer reply replied 8 months ago
Can't say that I paid attention. I will need to check if it comes on then.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

O​k, let me know about that, what was the reason for replacing the exhaust manifold?

Ask Your Own Toyota Question
Customer reply replied 8 months ago
Only the doughnut gaskets between the manifold and the pipe were replaced. They were leaking. There is still a slight noise like exhaust leak on that side which makes me think maybe a cracked manifold although I don't think that would cause the power loss issue.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

A​ cracked manifold can affect the oxygen content which can result in a lean air fuel ratio but you mentioned that this problem didn't happen until the gaskets were replaced. How long have you owned the truck?

Ask Your Own Toyota Question
Customer reply replied 8 months ago
Bought in December of 2016. The exhaust doughnuts and distributor cap, plugs and wires work was done about a month ago.
Last week I replaced the temperature sensors and thermostat.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

O​k, it's a little difficult from here because we can't get any diagnostic information from the DLC port, I assume you used the one inside at the left lower dash, there is another check connector under the hood that may give us some codes using a jumper but the check engine light has to be working. Or you can try fixing the obvious which is the exhaust leak and hope that takes care of it.

Ask Your Own Toyota Question
Customer reply replied 8 months ago
When the guy replaced the exhaust doughnuts is there a chance he damaged an O2 sensor? maybe by banging on the pipe with a hammer? How sensitive are the O2 sensors? They appear to be fairly new in appearance.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

I​f there's no physical damage to the sensor there should be no problem, make sure it is not the source of the leak.

I have to go offline in about two hours and will be back later this afternoon. If you can let me know about the check engine light that would be of some help and we can try getting some codes that way, I'm also going to try to find out if it has the correct version of this engine in it, the early versions had distributors and the later went to DIS systems.

Ask Your Own Toyota Question
Customer reply replied 8 months ago
Engine tag on valve cover reads E3Rz-N73. I may not be available after 4:00 this afternoon. I will look for the check engine light later this evening.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

O​k, sounds good, there were two versions the 2.4 and the 2.7 L, check the label under the hood if it says 2.7 then it's the correct engine. I'll check back with you later about the CEL.

Ask Your Own Toyota Question
Customer reply replied 8 months ago
Ok thanks.
Customer reply replied 8 months ago
Just realized I have a photo of the tag on the hood. It says Engine Family -- 2.71JGKEK. Along the bottom edge of the tag it reads 3RZ-FE RZN
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

Ok then it's the right engine, good news.

Ask Your Own Toyota Question
Customer reply replied 8 months ago
The check engine light does not come on when ignition is turned on without starting engine. Probably a bad light bulb? I will need to check it and replace it if bad. I will also try again to get code reader to connect. I can only work on it evenings so I will get back with you when I get a chance to do those things.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 8 months ago

Thanks for the reply, sorry for the delay in getting back to you,

the reason the code reader does not connect is related to the check engine light, it could be someone removed the bulb or it is burned out, in any case let me know and we'll go from there.

Ask Your Own Toyota Question
Customer reply replied 7 months ago
Ted,
Check engine light results:
I can find no bulbs that appear to be blown. No fuses under dash or under hood that appear to be blown. (did not check continuity on them)
Check engine light does not come on with ignition turned to on position. Switching bulbs from working positions into that
position and none work at check engine position.
There are three bulbs in that row of lights (check engine, 4 wd & ECT PWR) none of the three will light up.
The connector for that side of the cluster appears ok, wiggled its connection and no change.
Is there a reasonable way to verify that signal is getting to the instrument cluster? Or coming from the computer module?
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

With the cluster out and plugged into the harness you should see about 12 volts at one side of the circuit board where the check engine light bulb goes.

Ask Your Own Toyota Question
Customer reply replied 7 months ago
I will check for voltage on the cluster this evening. If none there is there a matching plug at the other end of the wiring harness for that side of the cluster that can also be checked?
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

There are two black/red wires at the connector to the cluster both should have 12 volts, these supply power to the lights, if they do then there may be a break in the circuit board or a loose connection or a bad ground, check all the small nuts on the back of the board, I've got to be offline until later today.

Ask Your Own Toyota Question
Customer reply replied 7 months ago
Ok, I will check those this evening.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

I'll check back with you.

Ask Your Own Toyota Question
Customer reply replied 7 months ago
I attached a photo of the back of the cluster. The CEL is on the left side along the bottom. The gray one.
Of the two wires for that bulbs circuit the black w/red stripe has 12v but the brown (or purple one) will not ground it. I grounded
my tester on chassis under the dash. I pulled the plug off to check it. I think the brown (or purple one) should be the ground side of the circuit because it connects all three bulbs in that row. I need to check the circuitry on the panel with jumper wires to ground and 12v power.
My time each evening to work on it is limited so sorry it takes me a while to get this done.
I also looked at the ECU wires and there is no black w/red stripe. Does that mean the power for CEL comes from fuse panel
under the hood? That's another place I could have a bad connection.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

P​ower comes through the 10A gauge fuse to the CEL the red purple (V-R on the diagram) is the control wire, the computer grounds it to either be on or off. I'm going to attach a diagram that may help in a follow up post. The other warning lights are also controlled by grounding through the computer, in other words there is no direct path to ground the computer grounds the lights if a fault is detected other wise the remain off.

Ask Your Own Toyota Question
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

B​y the way that circuit board doesn't look so well, that could also be the problem there are some solder spots that don't look right.

Ask Your Own Toyota Question
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

Keep in mind that the computer also must be grounded for this to work, white/ black wires are gound.

Ask Your Own Toyota Question
Customer reply replied 7 months ago
If I cannot get a voltage measurement between the black with red strip and the brown wire at the plug does that mean the ECU is not grounding it? Thus its not getting or just not sending a fault.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

The brown wire at the ECM (E1 in the diagram) is grounded all the time si if there is no voltage at the black/red wire measured to the brown wire ther is either no voltage coming from the fuse or a bad ground, try measuring from the black/red wire directly to body ground, any metal part, and see if you get 12 volts but it sounds like there may be no voltage to the B/R wire at all.

Ask Your Own Toyota Question
Customer reply replied 7 months ago
The B/R wire has 12v on it when grounded to metal. No voltage when grounded to drown wire.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago
Are you grounding to the brown wire at the computer
Ask Your Own Toyota Question
Customer reply replied 7 months ago
I am probing the brown wire at the plug on the instrument panel and the computer is connected to wire harness. I assume that the brown wire has to go to the computer to complete the circuit.
Customer reply replied 7 months ago
I was able to do more testing. I verified that the CEL circuit on the instrument cluster is functioning. The light works when power and ground is supplied at the cluster plug. I also traced the Wire form the ECU which is violet or purple. Did a continuity check to be sure I had the right one. Then used a test light hooked up to 12v and checked the wire at the ECU plug and get no ground connection when key is in on position. Even tried disconnection several sensors on engine and still nothing. I connected my code reader to the port again and it powers the reader but wont get codes. Any ideas?
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

T​he computer is supposed to complete the ground internally to turn the light on so it looks like it is the problem and that's also why the light does not turn on.

Ask Your Own Toyota Question
Customer reply replied 7 months ago
Are there any other tests I can do to verify function of the ECU?
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

U​nfortunately not yourself, there are shops online that test and repair them or offer an exchange or you might be able to pick up a sused one.

Ask Your Own Toyota Question
Customer reply replied 7 months ago
Ok thanks. Looks like I will need to replace it and then start diagnosing codes.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

Maybe it will fix the whole problem.

Ask Your Own Toyota Question
Customer reply replied 7 months ago
I will let know.
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

Best of luck.

Ask Your Own Toyota Question
Was this answer helpful?
Ask Ted Ritter Your Own Question
Ted Ritter
Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 4,629
4,629 Satisfied Customers
Experience: Toyota Master Tech, ASE Certified

Ted Ritter is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

THANK YOU, THANK YOU, THANK YOU!! I've got my baby back. Tomorrow I will get a tank of high octane, remove the top, go for a long long ride and enjoy my car. THANK YOU!

JugheadUSA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Chris (aka-Moose)

Chris (aka-Moose)

Auto Technician

1,001 satisfied customers

16 years of experience

Marty

Marty

ASE Certified Technician

180 satisfied customers

ASE & Bosch Master Tech. 30 years experience.

Amedee

Amedee

Toyota Technician

1,229 satisfied customers

ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

Anthony

Anthony

ASE Certified Technician

401 satisfied customers

ASE Master Automobile Technician with over 20 years exp. in this field.

Richard

Richard

ASE Certified Technician

9 satisfied customers

Toyota tech. ASE Certified Technician

Skyvisions

Skyvisions

ASE Certified Technician

12,737 satisfied customers

Toyota Master Diagnostic

Genchi Genbutsu

Genchi Genbutsu

Toyota Master Technician

3,761 satisfied customers

Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine

< Previous | Next >

Related Toyota Questions
95 Toyota Tacoma: 2.7 L , 4X4 When you..throttle..sputter..air filter
I have a 95 Toyota Tacoma with 2.7 L , 4X4 When you push on the gas lightly it is fine, but if you push a little harder even about 1/2 throttle or a little less is will bog down and sputter and act li… read more
Toyotapro
Toyotapro
Technician
Vocational, Technical or Trade Scho
9,283 satisfied customers
1986 toyota pickup: 22r engine 2 bbl carb..ngk..air filter
I have a 1986 toyota pickup 22r engine 2 bbl carb, that is missing when cold. Changed plugs (NGK replacement) wires, air filter. Was running fine until i changed plugs. Gap is set at 32.. It is burnin… read more
Mastertech 1
Mastertech 1
Lead Technician
Vocational, Technical or Trade Scho
1,755 satisfied customers
2002 Toyota Highlander Limited PCV valve
2002 Toyota Highlander Limited. PCV valve letting oil in the vacum line. Already replaced PCV twice. I ended up taking off the vacum line and shoved a bolt in it just so I could use the car to get to … read more
Ted Ritter
Ted Ritter
Toyota Master Tech
4,629 satisfied customers
I'm replacing the exhaust pipe and muffler on 2004 Tacoma
I'm replacing the exhaust pipe and muffler on 2004 Tacoma double cab. Ran into problem getting nuts off the sensor mount.....assuming its an O2 sensor....wondering if it is really needed - can I live … read more
Todd M
Todd M
Owner
ASE Certification
1,762 satisfied customers
Red oil leak onto tail exhaust pipe/box by rear passenger
red oil leak onto tail exhaust pipe/box by rear passenger wheel. What could be source? … read more
Mechanic01
Mechanic01
2,572 satisfied customers
I got a 88 toyota pickup 22re with glowing exhaust after
i got a 88 toyota pickup 22re with glowing exhaust after driving about 15 min. Just had new engine put in, new computer, new knock sensor,new injectors,new tps,new muffler with piping to headers, new … read more
Peter Bagley
Peter Bagley
master technition
Vocational, Technical or Trade School
1,194 satisfied customers
Loss of power. 2002 Tacoma prerunner. Air filter fuel filter
it starts good but it is using more fuel, im thinking the catalytic converters are plugged. … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
5,261 satisfied customers
Smoke in the exhaust, rough start up 1994 toyota hilux surf
white smoke in the exhaust, rough start up 1994 toyota hilux surf 3lt turbo. Diesel … read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
Smoke and bit water from exhaust ... increases when revevs
Hi White smoke and bit water from exhaust ... increases when revevs up .... is 'wet' not 'oily' … read more
gemmechanic
gemmechanic
Diesel Teacher
Vocational, Technical or Trade Scho
130 satisfied customers
I believe that coolant is leaking out of the exhaust on my
I believe that coolant is leaking out of the exhaust on my 2006 Camry 2az engine. I performed a leak-down test: … read more
Ted Ritter
Ted Ritter
Toyota Master Tech
4,629 satisfied customers
Just change my sparks plug and air filter car still keeps
Just change my sparks plug and air filter car still keeps cutting off … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
2003 Toyota corolla getting 5mpg exhaust smel. Not rotten
2003 Toyota corolla getting 5mpg exhaust smel. Not rotten eggs, loses power when fan blower is on high… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
It have smoke comes out exhaust every once in a while just
It have smoke comes out exhaust every once in a while just started today … read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
I changed the air filter and now it idles low and stalls. No
I changed the air filter and now it idles low and stalls. … read more
tim37857
tim37857
Mechanic
High School or GED
71 satisfied customers
The check engine comes on with the air filter in place. But
the check engine comes on with the air filter in place. But when I remove the air filter the check engine light comes on? Why ? … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
I have bought a replacement exhaust manifold with the
I have bought a replacement exhaust manifold with the catalytic converter and just want to make sure I go through the right steps to replace it myself … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Vsc and engine came on together after I has the air filter
vsc and engine came on together after I has the air filter replace,they left small air hose off.Put hose back on and reset codes, engine light went out,but vsc came back on. They also change gear shaf… read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
I have a 2006 Tacoma and got a P0430 code yesterday while
hello. I have a 2006 Tacoma and got a P0430 code yesterday while driving home. truck has 140000 miles on it. hoping i'm not needing to replace cats. any thoughts? thanks! … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
5,261 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x