How JustAnswer Works:

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

Ask Tim's Auto Repair Your Own Question

Tim's Auto Repair
Tim's Auto Repair, Mechanic
Category: Car
Satisfied Customers: 13014
Experience:  Have owned a repair shop for 25 yrs.
14541291
Type Your Car Question Here...
Tim's Auto Repair is online now
A new question is answered every 9 seconds

1991 Rodeo with 3.1 GM engine starts fine when temp above 50.

Customer Question

1991 Rodeo with 3.1 GM engine starts fine when temp above 50. Hard to start below 50 degrees. But once it starts, it can be turned off immediately and re-started with no problems. Fuel filter has been replaced . Also plugs wires, rotor, temp sensor. Runs fine. Good gas mileage. 220K miles regualr maintenance and oil changed every 400 miles
Submitted: 1 year ago.
Category: Car
Expert:  Tim's Auto Repair replied 1 year ago.

tims auto repair :

hi


 

Customer:

Hi what is the solution?

tims auto repair :

ok


 

tims auto repair :

a couple of things you need to do here


 

Customer:

OK what? I'm looking for an answer to my question

Customer:

start talking

tims auto repair :

first,,,,you need to check the fuel pressure,,these must have no less than 9psi at all times,,even while turning the starter


 

tims auto repair :

sometimes a weak fuel pump will do this


 

Customer:

fuel pressure is ok

tims auto repair :

ok


 

tims auto repair :

the next thing would be the ignition module


 

Customer:

fuel pump is OK

Customer:

ign module has also been replaced

tims auto repair :

i have seen bad ignition modules do this


 

tims auto repair :

how much fuel pressure does it have?


 

tims auto repair :

what can happen here,,is the starter can pull amps away from a weak fuelpump


 

tims auto repair :

you need to check the fuel pressure while turning the starter


 

tims auto repair :

it must have no less than 9psi with the starter turning


 

Customer:

had a problem several years ago that the vehicle started fine when cold and would stop after running a while and then would not re-start until the engine cooled down for several hours --ign module!


 


engine will start immediately when above 50 degrees outside. Hard starting below 50 degrees. ( temps just dropped here in Atlanta) the engine may have to be cranked 30-50 seconds to get started. sometimes it is like it is hitting on one cylinder, then two, then three ..."i think I can" once it starts, it runs fines. the engine can be cut off immediately after starting in this situation and will start normally immediately


 


this seems more like a computer type/electronic problem --which is why I first replaced the cold start sensor

tims auto repair :

i under stand that


 

tims auto repair :

did you replace the module for this problem?


 

Customer:

provide me a phone # XXXXX reach you so we can talk about this . So far we are "NO PAY." you have not solved my problem or provided me with anything I don't already know

tims auto repair :

sorry,,we are not allown to give or receive any personal info


 

Customer:

if it were the module now, it is unlikely that the engine would start --much less re-start immediately as normal after the initial start

tims auto repair :

yes


 

tims auto repair :

a module will do this


 

tims auto repair :

what it will do,,is kill the pulse to the injectors


 

Customer:

Sorry then. I have to say UNSATISFACTORY and refuse payment for service

tims auto repair :

if you will hang with me...we will fix it


 

tims auto repair :

are you willing?


 

tims auto repair :

or,,do you just want to use me to blow off steam?......i work on these every day


 

Customer:

So far, I don't see much to encourage me. I have worked on my own cars for many years. It is getting tougher due to computers. I have discussed this problem with several of my friends who are ASE mechanics. We have been thru all these things. No one has an answer. I didn't worry about it over the summer. This is a back-up utility vehicle, not my prime transportation so it has not been a high priority with me. The difficulty in starting is more of an irritant ...coupled with the fact that it does not make sense to me and I don't like problems I can't solve

tims auto repair :

ok...do you want to fix it?


 

tims auto repair :

if so,,we will test a few things


 

tims auto repair :

if not,,,we are wasting each others time


 

Customer:

I don't need to "blow off steam" I was hoping for a fix from someone smarter/more experienced than me. But I am not sure this is an on-line fix. I may need to give the vehicle to a shop and let them experience first hand what I have described

tims auto repair :

no


 

tims auto repair :

we can do it


 

Customer:

I am always willing to pay for results, but not for what I have gotten thus far ..and I say that with no disrespect intended

Customer:

I don't want to waste your time or mine

tims auto repair :

ok


 

tims auto repair :

lets fix it


 

tims auto repair :

are you ready?


 

tims auto repair :

is the engine cold now?


 

Customer:

Let's understand that if we can't fix it, I am not willing to pay for suggestions that did not solve the problem.

tims auto repair :

lol


 

tims auto repair :

ok


 

tims auto repair :

is the engine cold now?


 

tims auto repair :

on this site..you dont need to pay if we dont help you


 

tims auto repair :

are you ready to start?


 

Customer:

I drove it this morning to take my wife to the airport. My guess is that right now I could start it without a problem. It depends on the temp in the morning ..and temps are supposed to go up the rest of this week. The intermittent aspect of this makes it difficult to diagnose ..and especially if you are not here to see it firsthand and are trying to communicate as we are now


 


But I am willing to try whatever you may wish to suggest. However, it may be an in the morning kind of thing to see what the results might be


 


Your call whether to go forward

tims auto repair :

ok


 

Customer:

is that yes or no?

tims auto repair :

quit writing me novels...lol


 

tims auto repair :

we need to check a few things


 

Customer:

if yes, tell me what you want me to check and I will try to get that done today. I have several irons in the fire right now

tims auto repair :

and just answer a few questions


 

Customer:

fire away

tims auto repair :

there are a few things that can cause your problem


 

tims auto repair :

what you need to do,,


 

tims auto repair :

is to take the breather off of the throttle body


 

tims auto repair :

look at the two injectors


 

tims auto repair :

have your help to turn the engine


 

tims auto repair :

the injectors should pulse fuel when the starter is turning


 

tims auto repair :

when it is cold


 

tims auto repair :

i would think you dont have a pulse cold


 

tims auto repair :

the fist thing you will need to do


 

tims auto repair :

is to test the fuel


pressure

tims auto repair :

it must have no less than 9psi..anything less wont be enough pressure to push the fuel though the injectors


 

tims auto repair :

if the pressure is fine


 

tims auto repair :

then...


 

tims auto repair :

you will need to replace the ignition module,,,,when the ignition module does this,,testing them at the parts store may not help...sense it will still have a spark


 

tims auto repair :

the starter can pull amps away from a bad


ignition module,,killing the pulse

tims auto repair :

if the fuel pressure is weak,,replace the fuel pump


 

tims auto repair :

if both of these check out


 

tims auto repair :

remove the throttle body and clean the injectors


 

tims auto repair :

sometimes these will get clogged with deposits and not let it get enough fuel for cold starts


 

tims auto repair :





























1991 Isuzu Truck Rodeo (4WD) V6-3137cc 3.1L (CPC)
Fuel Pressure Testing and Inspection, Component Tests and General Diagnostics: Fuel System Pressure Test



1. Before servicing fuel system components, fuel system pressure must be released. To relieve pressure, proceed as follows:
a. Remove fuel pump fuse from fuse block.
b. Run engine until fuel remaining in lines is consumed. When engine shuts down, engage starter for approximately three seconds to relieve any remaining pressure.
c. With ignition off, replace fuel pump fuse.
2. Remove fuel line between TBI unit and fuel filter. Use a suitable back-up wrench to hold flare nut on throttle body when removing line.
3. Install fuel pressure gauge J-29658 or equivalent, between throttle body and filter.
4. Check pressure reading with engine running. Fuel pressure should be between 9 and 13 psi.
5. De-pressurize fuel system, remove pressure gauge and reinstall fuel line.
6. Start engine and check for fuel leaks.


 

tims auto repair :

if i am not right and it doesnt fix it


 

tims auto repair :

no need to pay


 

Customer:

problem #1 is I don't have a "helper" right now. My wife is out of town for then next week


 


Fuel pressure was fine when I checked that last winter during this problem, but I understand. What I don't understand is why the engine would immediately start again like normal after being shut off as soon as it "hard started"


 


I can put in another ign module but if that does not solve the problem, I am out the cost of the module since there is no return on electronic parts. If that works, HALLEJULAH! And you are a SMART guy!!


 


I'm feeling better about you with these specifics :)


 


I am going to cross my fingers


 


If I lose you now, how do I re-connect if these things don't solve the problem at hand?

tims auto repair :

the checks you done,,was then


 

tims auto repair :

we need to do them now why you have the problem


 

tims auto repair :

all you need to do..is sign in to justanswer and reply back to this thread


 

tims auto repair :

to boil it down.....


i think your problem is eiather the fuel pump...or the ignition module

tims auto repair :

 


 

tims auto repair :

no need to leave a rating yet


 

tims auto repair :

you can after you get it fixed....or reply back to me for more info


 

tims auto repair :

are you there?


 

Customer:

Since I said my guess was electronic to begin with, I am leaning toward the ign module. I was not aware that the ign module might prevent starting below the 50 degree mark as opposed to preventing starting when it heated up --perhaps causing a circuit "separation"


 


I hear you about doing them now vs then.


 


My initial diagnosis was fuel or electric --which is why I changed the fuel filter as a "first" step. Not expensive to do. Easy access. Normal maintenance


 


Thanks for the recs. I will give them a try and come back to you with success or failure.


 


I may go to the parts store today and get an ign module since I don't need a helper to try that


 


What part of the country are you located?


 


This Rodeo has been a GREAT vehicle. Very reliable and little maintenance other than routine consumables. A far cry from my Volco XC90. I won't won another Volvo! Nice vehicle. Good performance with the V*. EXPENSIVE parts and service ..and a LOUSY corporate attitude. I was told by the Corporate Service Manager of Volvo North America, "We don't condone customers working on their cars" when I called with a problem. I found that a bit arrogant

Customer:

Had to take a call

tims auto repair :

please unerstand..after you buy the module,,it is yours,,,id rather you check the pressure first....


 

tims auto repair :

then if the pressure is right,,then replace the module


 

tims auto repair :

if the pressure is low,,you will need to replace the fuel pump


 

Customer:

OK

tims auto repair :

 


 

tims auto repair :

im in tenn.


 

Customer:

OK

Tim's Auto Repair, Mechanic
Category: Car
Satisfied Customers: 13014
Experience: Have owned a repair shop for 25 yrs.
Tim's Auto Repair and 23 other Car Specialists are ready to help you

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:

 
 
 
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician