Question about 1987 Toyota MR2

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1987 Toyota MR2, "Engine Still Lacks Power", (4AGE), Twin Cam, 1600 CC, 4 Cyl.





From a dead stop engine runs as if it is running only on 2 cylinders. I have automatic transmission, when it is in "Park" or "Neutral" it runs fine, but in gear, engine severely lacks power from a dead stop, once you get up to about 20mph engine starts getting stronger, ran codes and code given is "all systems normal". Don't know what to do totally confused? Car has new fuel pump, also replaced shift solenoid in transmission cause my car was starting out in 2nd gear instead of 1st. When driving, my car wouldn't downshift all the way to 1st gear only to 2nd. So when you would take off you would be taking off in 2nd gear but that shift solenoid was fixed.
I had the fuel pump recently replaced i just assumed the fuel filter was replaced also cause my fuel pump is in the gas tank. My air filter is clean and I have 4 fuel injectors, no carburetor. A friend of mine who has looked at my car for me says it sounds like there is some kind of air leak but can't figure out where it is coming from?

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  • Anonymous Mar 25, 2014

    Replaced the seloniods in the transmission still won't go in gear what else could be the problem it's a automatic an it's 4 wheel drive 6 cyl any ideas tyty

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Sounds like you need gearbox oil (transmission oil in USA) .... check your levels and top it up.

Posted on Oct 31, 2008

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SOURCE: ENGINE LACKS POWER (4AGE) 1600 CC, 4 CYL, TWIN CAM

I had the fuel pump recently replaced i just assumed the fuel filter was replaced also cause my fuel pump is in the gas tank. My air filter is clean and I have 4 fuel injectors, no carburetor. A friend of mine who has looked at my car for me says it sounds like there is some kind of air leak but can't figure out where it is coming from?

Posted on Oct 28, 2008

6ya6ya
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Posted on Jan 02, 2017

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What is the cylinder order for a 4 cylinder toyota camry


It is 1-3-4-2 with No 1 being at the timing belt and crank pulley end.

Jun 09, 2014 | 2001 Toyota Camry

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1986 mr2 used up a full tank in 5 days


wow, i love MR2, sell it to me.... lust..... sorry.......
USA Car?????????
its sucking fuel, can be lots of things
got the FSM yet?, keeping a very old car like this going without the big book is near impossible...... really... why work blind>?
you got the 4A non turbo engine>?

1.6 L 4A-GE DOHC I4 (AW11)

wiki (USA)
As a power plant, Toyota chose to use the naturally aspirated 4A-GE 1,587 cc inline-four engine, a dual overhead-cam, four-valve-per-cylinder motor.[5] This engine was also equipped with DENSO electronic port fuel injection and a variable intake geometry ("T-VIS"), giving the engine a maximum power output of 112 hp

first what engine then what fuel injection.
Study the Denso system first, then trouble shoot.
If I had this, car i'd :
1: make brakes perfect.
2: fix all fuel leaks, every inch checked,!!!! top reason for midengine car fires...
3: compression on all cylinders (WOT) 150PSI or more.
4: full tune up with all fluids. really !
5: i'd then check all the EFI sensors and have the the injectors pro cleaned off car, (sonic cleaned)
6: engine thermosat holding water temp at 180F or more steady!!!
7: back flush every inch of cooling system and sub parts.

after all that id diagnose it.
starting with fuel pressure tests , all 6 of them.
ask.

TSB's the update MR2 engine signal (spark) generators (sensor)
old ones are no good.
bid away
http://www.ebay.com/itm/1986-Toyota-MR2-Manuals-/181281489430?pt=US_Nonfiction_Book&hash=item2a35380216


Dec 15, 2013 | Toyota MR2 Cars & Trucks

1 Answer

Mr2 wastes to much gas


i love this car. sell me your car. 1986 right>? no supercharger option.

i think i already posted to this.

IS the check engine light on, key on then go out running? no?

ill list the causes. (simple ) for the 50 reasons or better all tests, ask.

1: never tuned up. this decade or last 60k miles

2: thermostat missing or bad, frigid EFI sucks fuel like crazy .

3: too high fuel pressure.

4: ECT fibbing (bad) engine temp sensor , 300 ohms hot?

5: IAT ,same. (small mpg loss)

6: engine bad (low compression on 1 or more...cyl)

7: in limphome, yes, use the jumper wire and see the DTC flash codes. TWIN CAM Engine , right?, way advanced for 1986

8: air cleaner filthy. see tune up.

9: injectors leak or are clogged.

10: 02 sensor stuck at 0 volts. (forces max rich)

11: this car has an air flow meter, on front of intake, they get funky after 27 years. of flapping.

12: 02 sensor heater is dead. page FI-122 in FSM. 5 to 6 ohms.



stop.

this is twin cam engine, with Denso EFI, a nice early EFI, in fact

way ahead of others at this time.

that makes it easy to understand, its like todays cars.

see? do you need a free FSM. we have it?



most cars I restore this old fail all 12 above. all.

bad sensors. bad injectors (pro clean them at $20 each) ask)

bad fuel pressure regulator



there are simple test. for each, fail. all car covered in the very

good toyota, book,, each part.



what i do ,once tuned,up,

i check that coolant hits and holds 180F or more. Pyro gun (IR)

it must, if not will suck gas bad !

i like to cut corners, in test (mil training)

i like to do binary searches, (jump to middle of system and work to fail point)

saves time and pain.

I check that the engine runs in closed loop first.

page FI-120 in the FSM.

if it dont, the engine will suck fuel. this is an 0s sensor test.

i do it at IDLE and at 2500 rpm as the book shows. (in neutral)

see my logic here. i check for perfect closed loop operation.

I start with a new 02 sensor, if the prev. owner never did service.

if the new O2 is stuck at 0v or .9v , i work that.



see how that takes you to the actual problem fastest?



it does.



do ask questions, we can answer each.

how to diagnose, or do any test in the FSM.

Dec 15, 2013 | Toyota MR2 Cars & Trucks

1 Answer

What is the Compression supposed to be for a 1987 Toyota Pick up 22R with carb, 4 cyl.???


A new engine would be about 180 psi for each cylinder. As the miles add up and wear occurs, compression will get lower. The important thing is that compression is even and balanced-lowest compression reading should be within 75% of the highest cylinder's compression. Some Toyota engines had a minimum allowable compression of about 135 psi, but if compression is balanced, you could have average compression as low as 125 psi and engine would still run good, some loss of power but still acceptable, and oil consumption would not be that bad.
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Remember the important thing is to find compression readings that are very close to each other. I have an '87 Sentra with 75,000 miles(true!)-lowest comp. is 160, highest is 165 psi-runs great, good power. Also a '79 Datsun pickup (with god only knows how many miles-about 200,000 maybe). Compression is about 125-135 psi, fairly well balanced-noticeable loss of power, very little oil burning, still runs fair to good-dependable, at least.
That should give you an idea of what to look for. Good luck.

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1 Answer

1993 toyota pick up with a miss on cylinders 2 and 4


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The injectors on each bank are wired together, so they all open at the same time.
I'm going to ask how you know those cylinders are not firing ?
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ENGINE LACKS POWER (4AGE) 1600 CC, 4 CYL, TWIN CAM


I had the fuel pump recently replaced i just assumed the fuel filter was replaced also cause my fuel pump is in the gas tank. My air filter is clean and I have 4 fuel injectors, no carburetor. A friend of mine who has looked at my car for me says it sounds like there is some kind of air leak but can't figure out where it is coming from?

Oct 26, 2008 | 1987 Toyota MR2

1 Answer

Cylinder head


depends on engine code, and single cam or twin cam. check your code. D16W4 sohc stage 1. 29nm stage 2 72nm. D16Y5. stage 1 20nm. 2. 49nm. 3.67nm . 4. 67nm. there are 2 other codes for sohc engines these are the same as D16W4. DOHC engine as follows B16A2 stage 1. 29nm. 2. 83nm. hope this helps, if you are ot sure give m the exact engine code and i can verify.

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