1995 Toyota 4Runner engine just swapped

Tiny
OKEEPAH
  • MEMBER
  • 1995 TOYOTA 4RUNNER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 119,000 MILES
Hello, my 95 4runner just had it's engine swapped w a used engine. Since the swap, I've noticed several problems that need attention and am looking for advice b4 I bring it back to my mechanic, who just seems he wants to wash his hands of everything and says its running fine. When I got it back, it has a pretty good tranny leak from the front differential, which he felt a bottle of tran stop leak would fix, but hasn't. I'd like to avoid replacing the tranny if possible but perhaps as you hear more symptoms u may think this is related. When the car is first run, after warming up in driveway, my brake light will go on and off, but stays off after a few miles. On the days where it goes off and on, and sometimes when it doesnt, the car has no pickup whatsoever. U can get that engine up to 4500rpm w/o much actual acceleration at all. Not good on the highway going up a steep incline. Also, when traveling between about 1700-2200rpm the engine will buck like crazy unless I lay off the gas and pick it back up again. And most important to me, i've lost about 6mpg which equates to about 100+miles less on a tank. Known problems are the differential leak as mentioned b4, no back o2sensor, downstream of the converter, and lastly maybe its as simple as switching the spark plugs, since I just had them changed prior to switch, he was gonna put them into the swapped engine but saw that it had titanium plugs that he said should b good 4 100,000mi. I'm hoping it's as simple as the plugs, maybe gapped wrong, but i'd appreciate any imput you may have, could plugs really affect my mpg like that?
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Sunday, November 30th, 2008 AT 3:35 PM

3 Replies

Tiny
JACK42
  • MEMBER
Doubtful. Has he pulled any codes from the computer? (Check engine light on?) Those older V-6's had problems with the wiring pig-tail from the knock sensor to the wiring harness, which could cause the timing to be affected, which could cause these problems. It shouldnt leak trans fluid from the diff, it has gear oil in it, probably a damaged cooler line for the trans. The brake light could be low fluid. You have to give him a chance to make it good, let him know if he is unable to make it right that you will taking it elsewhere to have it repaired and that he will be paying for it if he cant make it run properly, part of installing an engine is making it run right, some things are out of his control, but he should be able to find theproblem, then let you know where it is going from there
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Monday, December 1st, 2008 AT 8:06 AM
Tiny
OKEEPAH
  • MEMBER
Hey jack, thank you for a quick response. I pulled 2codes off the diagnostic box, a 25
--AIR/FUEL RATIO LEAN INDICATOR--LEAN SIGNAL SENT TO ECU FROM O2 SENSOR
--INJECTOR FAULT(S)

--FUEL PRESSURE

--OXYGEN SENSOR

--AIRFLOW METER OR MAP SENSOR

--IGNITION

--ECU
and a 27
--SUB-OXYGEN SENSOR CIRCUIT OR SUB-OXYGEN SENSOR HEATER CIRCUIT
--SUB OXYGEN SENSOR/HEATER/CIRCUIT

--ECU
I'm assuming both of these are due to the fact i'm missing my back o2 sensor? I thought I read somewhere that there's a trans diagnostic box I can also read from? Maybe i'll check that out too.
The liquid from the diff I was just assuming was trans fluid, ur saying it was gear oil? I just know its leaking right from the diff. He said he filled it w/ full synthetic to help the trans, that's why I assumed it was tranny fluid. He changed out a bad EFI switch and I beleive he also said he had to change the knock sensor b4 he gave it back. This has come back to me and i've had to bring it back to him multiple times so far due to these issues. I understand what ur saying about his responsibility in this but short of bringing him to civil court I don't know how to get it done right or have him pay for it to be fixed elsewhere. I found him on craigslist and he did the work under the table from the shop he works at for his 9-5. Could missing the back o2 sensor have any of these affects? I had to have the cat replaced due to it being plugged and had a universal installed but due to the price of the o2 sensor, I haven't put that in yet? Thanks for your help so far.
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Monday, December 1st, 2008 AT 10:02 PM
Tiny
JACK42
  • MEMBER
The 27 could be from the o2 sensor. But the 25 is probably why it doesnt run right. If it is lean it willl run like you describe. Check for cracks in the air intake boot between the MAF and the throttle body. And try spraying around the intake area with carb cleaner, the idle will change if you spray a leak. You really should use a shop and get a receipt when having jobs like this done. If ok, you will need to tap into the fuel system with a gauge and verify good fuel pressure. Dont forget to post about his work in "rants&raves". Lol
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Tuesday, December 2nd, 2008 AT 7:39 AM

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