Sambo Posted April 8, 2014 Share Posted April 8, 2014 I've been advised that the reason the 4AGE in my AE85 is running so rich is that the pump is delivery about twice the standard fuel pressure and the standard FPR can't cope. Before I cough up for an after market FPR I wanted to get a second opinion. Could this even be the cause? Ideally I would swap to a full AE86 fuel setup, but I can't find one. I think it was Truenotch who pointed out that the wrong injectors (high vs low impedence). I did have the wrong type in there, but have got high impedence now and have run for a few minutes with no improvement, could it take longer for the ECU to adjust? Quote Link to comment Share on other sites More sharing options...
Yowzer Posted April 8, 2014 Share Posted April 8, 2014 Plug in a pressure gauge and find out. It should be around 43ish PSI off the top of my head Quote Link to comment Share on other sites More sharing options...
Sambo Posted April 8, 2014 Author Share Posted April 8, 2014 Yeah, it was a clued up 4age mechanic who gave the diagnosis after chucking the gauge on. I know that the pressure is too high, it's just whether it's the main cause of the issue. Aside from the clouds of smoke it drives really well, power seems right up there etc etc. Quote Link to comment Share on other sites More sharing options...
Yowzer Posted April 8, 2014 Share Posted April 8, 2014 Ah OK. So uh, I have no idea how much the standard reg can handle, perhaps whip it off and check if it's blocked. Quote Link to comment Share on other sites More sharing options...
kpr Posted April 8, 2014 Share Posted April 8, 2014 could just try another factory reg. pressure shouldn't go up much unless pump is massive, otherwise more info required what return line are you using what pump? when do clouds of smoke happen? which 4age? and everything else Quote Link to comment Share on other sites More sharing options...
Sambo Posted April 8, 2014 Author Share Posted April 8, 2014 Pump is massive: Bosch 910. Return line is standard 85. I was planning to upgrade this anyway (is it easier/cheaper to get new hardlines bent up or use something else?) There's always smoke, from idle right through to WOT/redline. More throttle = more smoke Smallport 4age - Standard bar intake and exhaust mods and now 4EFTE 295cc high impedence injectors. Standard ecu etc. Quote Link to comment Share on other sites More sharing options...
kpr Posted April 8, 2014 Share Posted April 8, 2014 they should be green 235cc for smallport. change to them, should fix it edit 4efte ones are light green. smallport fairly dark green Quote Link to comment Share on other sites More sharing options...
Sambo Posted April 8, 2014 Author Share Posted April 8, 2014 You reckon? I thought that with the 02 sensor it should correct for the extra capacity? Or not that much adjustment? Quote Link to comment Share on other sites More sharing options...
kpr Posted April 8, 2014 Share Posted April 8, 2014 nar, they wont adjust that much especially on an old ecu like smallport. pretty sure it will ignore the o2 sensor past a certain load also Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted April 8, 2014 Share Posted April 8, 2014 Also what was the pressure when tested? Quote Link to comment Share on other sites More sharing options...
Sambo Posted April 8, 2014 Author Share Posted April 8, 2014 Ahhh, I don't have the figure handy. Was waayyy over 43psi though. Somewhere between 60 to 80. Damn. I was stoked when the 4EFTE injectors went in without changing plus too . Might have to pay wreckers prices to get some.. Quote Link to comment Share on other sites More sharing options...
kpr Posted April 8, 2014 Share Posted April 8, 2014 stock lines are pretty small from memory. test the fuel pressure with the return line off, going into a bucket or something. if pressure is the same as with the return line on. not much point changing the line. ive ran with a bigger pump on stock reg, injectors & ecu. afr was perfect on wideband. if the injectors don't solve it and the pressure is actually that high, i would look at doing the test above ^ should tell you if its return line or reg issue. i wouldn't think you would get anywhere near that pressure with factory reg on that pump. Quote Link to comment Share on other sites More sharing options...
kpr Posted April 8, 2014 Share Posted April 8, 2014 actually if pressure was that high on 4efte injectors. it would be lucky if it even ran. first thing i'd do is swap the injectors Quote Link to comment Share on other sites More sharing options...
Sambo Posted April 8, 2014 Author Share Posted April 8, 2014 Awesome. Thanks man. So this still sounds consistent with the pink injectors that were in there before? Exactly the same issue. Quote Link to comment Share on other sites More sharing options...
kpr Posted April 8, 2014 Share Posted April 8, 2014 sounds like it. what were they out of? Quote Link to comment Share on other sites More sharing options...
Sambo Posted April 8, 2014 Author Share Posted April 8, 2014 Not sure... Maybe AE82 or 4AGZE? 4AGZE is of course still huge. AE82 is smaller than smallport but low impedence? Quote Link to comment Share on other sites More sharing options...
kpr Posted April 8, 2014 Share Posted April 8, 2014 bigports are smaller yeah, but are square plug. running the numbers on the side through google usually works, if you wanted to find out what they are. Quote Link to comment Share on other sites More sharing options...
Sambo Posted April 8, 2014 Author Share Posted April 8, 2014 Do these look like the right ones? Sorry, never had a set so I'm not sure. Quote Link to comment Share on other sites More sharing options...
kpr Posted April 9, 2014 Share Posted April 9, 2014 Yup, looks like the right ones Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted April 14, 2014 Share Posted April 14, 2014 I think I've got a set of those green injectors? Rail looks very familiar Quote Link to comment Share on other sites More sharing options...
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