struth

Hi guys, I fitted an EFI 5.0 from a VT vintage calais into my Toyota 4 Runner, goes real great for offroad when it's running correctly.

I have fitted a Dr Bob memcal to suit a manual, so that side is good.

The problem I have is, I believe, electrical or signal to computer. When the motor is running fine it is all torque all the time, but it runs bad more than good. When it runs bad it is basically gutless for a V8. When running good it will only consume 13.5 litres per 100km on 33" diameter tires, which is fantastic economy. When bad it will use 25 to 30L per 100km.

It has suffered an ignition module failure and two coil failures in seven months.

I had diagnostics done and came up with, O2 sensor-since fixed, vacuum leak-which didn't reappear after it was reset, no BCM-which is ok memcal takes care of that and no speed sensor.

I do want to connect the speed sensor but my Toyota is a limited model with cruise control, so try finding a wiring diagram for the little box of tricks that control the cruise.

I know enough to have installed the engine and wired it to the Toyota myself, but I am at my wits end regarding this on again off again performance issue.

So long story I know, but can anyone suggest either where to start or who in Melbourne would be able to help.

Cheers

struth

Can anyone offer some advice here, if not can you suggest who I should take it to.

Cheers

allports

Where did you get the Dr Bob memcal. Maybe you could start by asking them.

__________________
If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
Albert Einstein
Without deviation from the norm, progress is not possible. Frank Zappa

PVE

Describe how the diagnotic was done? What tool and software?

struth

Memcal came direct from Dr Bob.
The problem was already apparent before the original auto memcal was changed out for the Dr Bob manual memcal.

Cheers

struth

Diagnostic was done with a scanner.

results were,
13 oxy sensor signal,
36 vacuum leak,
35 idle speed error,
31 theft deterrent signal missing,
92 low speed fan or no BCM response,

The vehicle has no BCM and the Memcal has been altered to ignore this.
The speed sensor is not connected.

13 was repaired,
36 did not re occur after reset,
35 remained
31 remained,
92 remained.

A check by spanner tonight shows the inlet bolts to be loose, so I will remove the fuel rails and torque these up tomorrow night, this could be the issue with lack of grunt, but wouldn't explain the dead coils.

Cheers

PVE

Loose manifold...... that would do it.

allports

Isnt that why they call it Extra Fkd Injection (EFI) Lol

__________________
If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
Albert Einstein
Without deviation from the norm, progress is not possible. Frank Zappa

struth

I bloody hope so I have been chasing this issue for months now
The bolts are certainly not torqued enough but they arent completely loose just real easy to tighten some more with and open ender/ring.

I can live with the odd coil going south, but not having this lack of grunt that I know will be caused by something simple.

Cheers

PVE

I am unsure as to other peoples experience with manifold seal.

I have seen:
** Incorrect angle machined on the port face so there was a 0.020" gap at bottom edges and consequently it was impossible to get consistent idle.... breathed into the crankcase.
** After market gasket generally does not work as well as OEM.
** Manifold pulled down unevenly.. poor initial setup and wrong bolt tension sequence.

Maybe the very experienced do not need to use a torque wrench.

Strongly recommend you use a torque wrench in the correct bolt pattern sequence and do them up in at least two stages. Run it for a week then re-torque.

struth

Yep will be torquing up as per the manual.

Cheers

struth

Think I got it solved, 2 of the manifold bolts required nipping before they reached 17 Nm and 4 required nipping before they reached 41 Nm.

Also all the injectors seals where they seat in the manifold were dry as, so I oiled them before reassembly.

She has mucho grunt again

Will send it off for a full injector service later in the week.

PVE

Thats good news.

INJECTOR SERVICE! What type? Don't waste money with one of those additive things.

A proper Injector service requires ultrasonic cleaning and flow matching.

struth

Good question she went to an EFI specialist in Bayswater for an injector service today, pick it up tonight.

Cheers