Author Topic: No Check engine light with key on 90 toyota 3.0  (Read 1523 times)

0 Members and 1 Guest are viewing this topic.

Ctdogman1

  • Offline Dusty Trails
  • *
  • Turtle Points: 0
  • Male Posts: 5
  • Member since Oct '18
  • Crawling with Marlin
No Check engine light with key on 90 toyota 3.0
« on: Oct 24, 2018, 06:29:41 AM »
 Have a 1990 Toyota pickup 3.0 it runs Great "if it starts" when I turn the key the to the on position if the check engine light turns on it will start right up, if there is no check Engine light it will crank but won't start. There is No spark coming from the coil ( I did replace the coil and ing module) I changed the ignition fuse.

Also noticed when the engine is running, the EFI relay get to hot to touch and the wire coming from the fuse box to the POS side of battery is also hot, (Not sure if it matters but its a Toyota Motorhome)
 This problem started out with happened every once in awhile (thought i had it fixed) and then got worst, The last time I broke down on highway, i was sitting with the key in the on position and there was no "Check engine light" as I was calling for a tow with the key on I heard a click and the "Check engine light appeared, The truck started and i drove about 60 miles without a problem, Once home I shut off engine and no "Check Engine light and truck wouldn't start.
:-P

Dingman.

  • Offline Silver Turtle Award
  • *
  • Turtle Points: 926
  • Male Posts: 3,430
  • Member since Oct '08
I had a very similiar issue with my 4runner after i did my 3.4 swap.  It ended up being a bad connection on one main wire in the main harness near the ecu.  So with my experience alone i would say to start wiggling different areas of the harness and see what section makes the light come back on, then move on from there.  Once i finally fugured out the problem area i was able to bend the ears slightly on the connector so it made better contact and that solved my issues.


Ctdogman1 [OP]

  • Offline Dusty Trails
  • *
  • Turtle Points: 0
  • Male Posts: 5
  • Member since Oct '18
  • Crawling with Marlin
Thank you Dingman

 I pretty much wiggled all  the wires but will try again.
:-P

Dingman.

  • Offline Silver Turtle Award
  • *
  • Turtle Points: 926
  • Male Posts: 3,430
  • Member since Oct '08
I know it is probably far fetched to think you have the same issue unless you recently did work involving the harness, but my issue was in one of the harness connectors that is located behind the ecu.  I wish i could remember more for you.

gnob

  • Offline Crawler Guru
  • ****
  • Turtle Points: 446
  • Posts: 658
  • Member since May '02
Sounds like maybe your efi relay is dying.
I have also seen sensors go bad on 3.0, the short pulls the computer down enough to keep the CEL from coming on.
hold this. . .

05sport4x4

  • Online Rock Master
  • ***
  • Turtle Points: 1978
  • Posts: 160
  • Member since Jan '07
I had a problem with a 1989 22RE that would crank and not start randomly.  I replaced the ignitor which did not solve the issue.  I never noticed if the check engine light was on or off but the problem was a bad distributor.
John

05 4Runner Sport 4x4 V6 - Hanna Sliders
89 Extra Cab 4x4 Pickup, 22re, 31x10.5 w/4.56's & ARB in rear

Willard

  • Offline Crawler Guru
  • ****
  • Turtle Points: 1207
  • Male Posts: 497
  • Member since Dec '14
  • Crawling with Marlin
    • Buy me a beer
I had a similar issue with my '90 4runner 3.0. It ended up being a bad ground on the firewall to the harness. It is a small rectangular connector center of firewall behind the plenum. Replaced the connection and as much wire as possible and no further issues on my end. Hope that helps..... :crossed:
90'4runner......lots of goodies.

Ctdogman1 [OP]

  • Offline Dusty Trails
  • *
  • Turtle Points: 0
  • Male Posts: 5
  • Member since Oct '18
  • Crawling with Marlin
 what sensor? gnob
:-P

gnob

  • Offline Crawler Guru
  • ****
  • Turtle Points: 446
  • Posts: 658
  • Member since May '02
Any of the 5V sensors. AFM, tps, ECT. Also make sure the o2 wires aren't chafed.
I would probably start at the efi relay. I did a job recently where the spades in the fuse panel were stretched and causing hot start issues for a guy.
hold this. . .

Ctdogman1 [OP]

  • Offline Dusty Trails
  • *
  • Turtle Points: 0
  • Male Posts: 5
  • Member since Oct '18
  • Crawling with Marlin
 Thank you everyone for your help, I'm hoping to be able to work on it this weekend, I will let you all know the outcome.  :bowdown:
:-P

OOPS

  • Offline The 2.5K Group
  • ****
  • Turtle Points: 845
  • Male Posts: 2,522
  • Member since May '02
Could also be the main ground wires coming from the ECU to the back of the engine. They are located below the head on the passenger side of the engine in the back. Kind of a bummer to see and get to. I had forgot to hook them up when I did a body swap, no CEL no start.
David & Theresa Fritzsche, 1990 Ex-Cab with a few mods!!!!!!!!! Roseville, CA Sobriety =Serenity

Tango Alpha

  • Offline Dusty Trails
  • *
  • Turtle Points: 0
  • Posts: 1
  • Member since Oct '18
  • Crawling with Marlin
Just another suggestion from an old guy that used to work on stuffs that have lots of wiring harnesses.

Wiggling harness means push and pull on the wire bundles SLOWLY and GENTLY in different direction while observing if the bad intermittent problem shows up.  Sometimes a wire that is subjected to long term vibration will break but still make connection with broken ends touching.  Same can happen when a connector pin has backed out a bit and has poor mechanical connection, but still maintain an operable electrical connection.  These poor connections can cause a temperature rise in the vicinity.  You can also have a high impedance short, like a power carrying wire insulation got chaffed and touching metal occasionally.  Shaking wire bundle SLOWLY and Gently can replicate some of those conditions and gives the symptoms again.

Good luck in locating that fault. :crossed:

OOPS

  • Offline The 2.5K Group
  • ****
  • Turtle Points: 845
  • Male Posts: 2,522
  • Member since May '02
Sometimes the grounds break loose at the splices in the harness, found one in mine!!

https://imgur.com/a/OvfcxAo
David & Theresa Fritzsche, 1990 Ex-Cab with a few mods!!!!!!!!! Roseville, CA Sobriety =Serenity

Gnarly4X

  • Offline The 2.5K Group
  • ****
  • Turtle Points: 3599
  • Male Posts: 2,968
  • Member since Jun '16
  • Marlin and I slid "The Sluice" Martinez Canyon
    • Buy me some coffee
Just thinking out loud....  may not have anything to do with your intermittent issue?  :dunno:

What condition is your battery in? 

Is the battery a wet cell with caps that you can remove to check cells electrolyte with hydrometer?

Have you checked and cleaned the battery terminals, cables and clamps at the battery?

Have you checked the output voltage of the alternator?

Gnarls.  :gap:
1986 XtraCab SR5 22RE 5speed W56B, ~26,000 MI after break-in, DIM (Did It Myself) rebuilt engine - .020" over, engnbldr RV head, OS valves, 261C cam, DT Header. https://imgur.com/oACTHTR

 
 
 
 
 

Related Topics

3 Replies
1614 Views
Last post Oct 15, 2002, 01:02:17 PM
by dan_b
5 Replies
2108 Views
Last post Dec 01, 2006, 11:26:13 AM
by spacoli
0 Replies
1345 Views
Last post Dec 12, 2006, 01:23:28 PM
by BLACKDOG
10 Replies
1811 Views
Last post Nov 25, 2010, 10:20:44 AM
by 4RunnerChevy
2 Replies
703 Views
Last post Nov 01, 2018, 12:28:31 PM
by crawlerdan