Code 44 lean condition on 84 C4

Thanks again for your insights. I was primarily worried that, even though the hangars looked identical from the photos, that I was missing something that required me to use the 84 sending unit, the difference in price, though minuscule, not withstanding.

I do see that the 85 pump kit has different bits an pieces to it, which was confounding me. Since this more powerful pump is what I want, I’m happy to mate it with the 85 sending unit as I would like to maximize its potential.

At the moment, this is like an incremental puzzle for me to do things that really don’t alter the stock appearance, but will satisfy my perfecting that which my knowledge and pocketbook allows.
Through your links, I am becoming well versed in what I could do, but will be slow to do them pending something drastic happening to my cars mechanicals. Having said that, always on the lookout for a Renegade.

Question: Do OEM 1985 C4s come with larger diameter fuel lines and a higher capacity in-line filter when compared the OEM 1984 C4s?
 
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the fuel filter looks different on the 1985 from the 1984 and its located in a different place,if I remember correctly
on most c4 vettes its under the pass seat floor area, I can't remember where it is on the 1984 at the moment, but I think its in the engine compartment
The filter being mounted on the frame rail just to the right of the starter and below the A/C housing could be considered as being in the "engine compartment".

in any case the fuel lines large enough to work with either pump as the engine can't use all the fuel either pump in good condition can pump, as theres a constant bypass of fuel back to the tank.

pay attention to the arrow on the filter, or at least how it mounts as the way it is mounted as to fuel flow direction thru it matters

1984
1985-96
 
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Grumpy said:
the fuel filter looks different on the 1985 from the 1984 and its located in a different place,if I remember correctly
on most c4 vettes its under the pass seat floor area, I can't remember where it is on the 1984 at the moment, but I think its in the engine compartment
The filter being mounted on the frame rail just to the right of the starter and below the A/C housing could be considered as being in the "engine compartment".

in any case the fuel lines large enough to work with either pump as the engine can't use all the fuel either pump in good condition can pump, as theres a constant bypass of fuel back to the tank.

pay attention to the arrow on the filter, or at least how it mounts as the way it is mounted as to fuel flow direction thru it matters

1984
1985-96
Click to expand...
My 84 fuel filter is also under the passenger floor board, but it’s connectors sure do look different. Mine are connected via a short flexible hose on each side tightened with 2 worm clamps on each side. Hopefully, since my fuel pressure should be well under 15psi, I don’t think I’m obligated to get those metal connectors associated with solid lines yet, however, at some point I will be replacing all those rubber gasoline hoses and segments, just to be safe.
 
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If I were to replace those segments of 40 year old rubber fuel line, I’m trying to figure out the proper sizing and characteristics. The inlet and outlet diameter of the inline fuel filter is 3/8 inch. So is it 3/8 inch line I want or 5/16 inch?
Since my TBI fuel injection system is relatively low pressure, should I choose, for example, Gates Barricade rated to 50 psi or the 225 psi variety?

While I’m at it, I wanted to replace all the vacuum lines in the engine compartment. What size hose do I need and how much line do you think I would need to complete it?
 
your 1984 OEM throttle bodys are designed to operate with the fuel pressure at between about 15psi-18psi there's only going to be problems if you boost fuel pressure much above that level if you don't modify the throttle bodys to operate at the new higher pressure, the fuel pressure regulator on the 1984 should even with the better fuel pump, still limit the fuel pressure to a very desirable 16psi-18psi, which in theory will provide all the fuel the engine can use. keep in mind the old 1984 fuel pump was well documented to occasionally allow pressure to fall below about 12 psi with advanced age and if the fuel pressure regulator was not operating correctly, the potential benefit you get from the larger flow volume if you install a newer fuel pump, is there's far less chance of running lean due to lower flow volume and pressure.
BTW there are adjustable aftermarket fuel pressure regulators easily available to allow you to tune the larger fuel pump pressure and flow precisely.
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if you really want a benefit there are aftermarket throttle bodys designed to operate at the more common 40 psi of the 1985 TPI system fuel pressure level, yes your 1984 corvette CAN produce impressive power but the mods and parts required are not CHEAP!
but the 1984 corvette throttle bodys will not work correctly if the pressure boosted to the 40 psi level
the issue is not the throttle bodys its the 1984 CORVETTES OEM components that HAVE RESTRICTED FLOW, your power restrictions in the heads and intake with their very restricted air flow
keep in mind the stock 1984 corvette made less than 210 hp, so the OEM components were ok, at that power level, but once your intention is to boost power changes need to be made, if you think a simple change to the fuel pump will result in a massive increase in power all by itself your beating a dead horse! yes it will help, but other mods are required if you intend to see a big power increase.
look this is modification is very well documented, many people have done hundreds of mods, to the 1984 corvette, some worked , many did not!
read the links and benefit from not making mistakes other people made before you and benefit from what they found worked!
RE- read the previously posted links and sub links several times

1984 crossfire vette won,t run right?

I have a 84 crossfire injection corvette I set the timing and it misses horribly if I advance the timing it idles high but takes gas better but still misses and stalls the computer throws code 51 I have two ECMs I've tried and two different chips still same problem and same code BUY A FACTORY...
garage.grumpysperformance.com

84 Crossfire Corvette Second Round Of Mods

It's finally time to do the second round of engine mods to the Corvette. I've been daily driving it for over a month now after it's year long hibernation. It's running very good and all the previous mods were well worth the effort totally different car now than when it first came into my life...
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1984 Corvette questions.

I have the chance to buy 2 84 vettes. One is red at a dealer w 22k on it faded paint/peeling clear for 10g. Its a nice car (stock) but with the paint issue it makes me wonder if its been redone. Dealer says no. Hes a friend so I KIND OF trust him.Ive looked it over good and cant find any...
garage.grumpysperformance.com

renegade intake? for cross fires

JUST CURIOUS? not knocking or praising this product just looking forward to testing one and yes Im only too familiar with the delays and problems of producing components on more than a custom,one of basis, for at least a year Ive heard rumors that the RENEGADE x-fire intakes will be available...
garage.grumpysperformance.com


http://www.thecubestudio.com/CrossfireT ... sIndex.htm

http://www.thecubestudio.com/CrossfireT ... ancing.htm

http://www.technovelocity.com/chevyhack ... olish.html
http://garage.grumpysperformance.com/index.php?threads/got-a-cross-fire-corvette.640/#post-50502

http://garage.grumpysperformance.com/index.php?threads/ported-crossfire-383.10240/#post-41000

http://garage.grumpysperformance.com/index.php?threads/a-few-cross-fire-tips.303/#post-987

http://garage.grumpysperformance.com/index.php?threads/renegade-intake-for-cross-fires.2796/

http://garage.grumpysperformance.com/index.php?threads/1984-corvette-questions.4918/#post-13583

http://garage.grumpysperformance.com/index.php?threads/1984-crossfire-vette-won-t-run-right.10096/

http://garage.grumpysperformance.com/index.php?threads/bits-of-crossfire-info.1148/#post-2333

got a cross fire corvette

Got these pics from another forum; they are of the new Renegade manifold for the CFI installed on a 1984. The following is a statement from the makers DCS: Please note that we are not releasing any internal pics or technical specs at this time. The reason for this is the design is not 100%...
garage.grumpysperformance.com

http://garage.grumpysperformance.com/index.php?threads/a-few-cross-fire-tips.303/#post-986


the stock 1984 cross fire cylinder heads are pathetically restrictive
more info
just a bit of info on those stock #624 head flow rates

.......intake....exhaust
.100..44..........41cfm
.200..101..........82cfm
.300.155..........125cfm
.400..182..........137cfm
.500..196..........140cfm
READ THRU THE LINKED INFO ABOVE
Engine
Cross-Fire Fuel-Injected V8 Engine5.7 Liter (350 Cu. In.)
BlockCast Iron Alloy
PistonsForged Aluminum
CamshaftCast Iron Alloy
Bore4.00’
Stroke3.48”
Horsepower205 net @ 4300 RPM
Torque290 ft. -lb. @ 2800 RPM
 
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I haven’t had time to deal with the fuel pump, fuel sensor or fuel sock issue since life has gotten in the way. However I have been driving the car putting over 1000 miles on it reliably.

One regret I have in pursuing the intermittent CEL code for lean condition issue is I found my buried receipt from 2013 when my C4 was a “no start.” This was only 3K miles ago. The Corvette shop who worked on it replaced many, many things as I asked them to do a comprehensive tune up. But several of the items relate to the current detective work. The pertinent replaced items were a new fuel pump, sock, fuel filter, as well as a new O2 sensor. They also “removed catalytic converter for a test pipe install,” which I’m not sure what information that would give. They did reinstall the catalytic converter with new hardware. Besides the K&N air filter, plugs, HD ignition wire set and HD Accell cap&rotor, they changed the coolant, updated the coolant sensor + pigtail. They checked the MAP, TPS sensors, tested the ignition module +coil which they “custom terminated the wires.” They reinstall ?factory? computer +? tent shields.
Needless to say that the bill was quite a bit as they did some other odds and ends.

Since that service, the car had been mostly sitting in the garage with an occasional start and old gas until my efforts to revive it and bring it up to date.

So the O2 sensor could still be faulty, but it has very little mileage on it. Since the car sat with old gas, I guess the sock could be full of gunk on it and in the gas tank. But by mileage, that fuel pump is not old and tired. I did replace the fuel filter recently.

I will get around to replacing that fuel pump with the more powerful 1985 version with a new stainless hangar, sock and tank cleaning eventually.
 
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