Help, Rb20 Tries To Stall/die Randomly

[AgentA31]

Gday All,

A couple of times recently while driving the rb20 cefiro ghettomobile, the engine randomly lost all power, like I'd switched the ignition off. By pumping the accelerator it will then fluttered a little then pick up power and continue driving normally.

I replaced the ignitor and cas then drove it last night and the problem is still there, its also hard to start.

Its an R32 RB20det running in an A31.

Should i be looking at TPS, the AFM or what?

Thanks for any help or advice you can offer,

Agent A31

[GTSBoy]

AFM or fuel pump. Potentially one or more ignition coils. They like to crack the shits when they get hot.

[AgentA31]

Thanks for your reply, Its a bit of a weird problem.

I will investigate the AFM and give it a clean for starters.

Its not a missfire because all cylinders lose power at the same time stay off for a few seconds then return,

so Im thinking its probably not coils this time. (Ive had dodgey coils before and been through that).

Fuel pump is a bosch 040 not a 30 yr old flogged out nissan job so Im leaning away from that option too.

thanks very much for your suggestions

Agent A31

[scotty nm35]

040's are a shit design, do a search around, they are very common pumps to block up, as the mesh is so fine. I wouldn't rule it out just yet...

[AgentA31]

Ok sorry to drag this up again fellas but Ive still got this problem.

So far:

-my coils are fine

- Ive cleaned the z32 afm- is there anyway of checking this or do I just have to bite the bullet and buy another if I suspect it?

will be checking fuel pump next.

Thanks for any help

Agent A31

[scotty nm35]

Where are you? I have a spare Z32 you can borrow to test, as long as you can drop in here... I'm in Hampton Park Vic.

Just drop an e85 Walbro in the tank and never look back.

[AgentA31]

Thanks heaps for the offer mate, sadly Im in Qld so will have to figure something else out,

Thanks again

Agent A31

[AgentA31]

Ok so today I pulled out the 040, it looks fine with only about 2 specs of dirt on the mesh filter. I put in back in and pulled off the fuel supply hose to the engine, with ignition on it pumps quite a bit of fuel so Im guess the pump is ok and I should start looking at the AFM.

Anybody got any more suggestions?

Thanks

Agent A31

[GTSBoy]

You need a pressure test on the pump. Just because it pumps a large volume with no restriction, doesn't mean that it can keep up when the backpressure rises. Plumb fuel pressure gauge into fuel line and see if it maintains pressure as you run the engine at load.

Having said all that, it probably is the AFM (or something else electronic).

[AgentA31]

Thanks mate, was thinking along those lines a little myself. Im looking for some sorta fuel pressure gauge now just to be sure,

cheers

Agent A31

Edited March 29, 2014 by AgentA31

[pdot]

Does this happen under a certain circumstance like when slowing down or anything like that? Currently got a similar issue in our r32 but only when coming to a stop and has currently been diagnosed as a vacuum issue

[AgentA31]

Hey mate, cant think of any particular circumstance causing this, it happened once immediately after I gassed it hard and changed gear, another time while cruising at steady highway speed, so seems a bit random? Any more details of your own situation?

AgentA31