WranglerFIN
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Posts
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Thank you Moses. There sure will be time when I need to ask more help, but until then have a nice summer and stay safe
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Hello Moses! Finally injector arrived and we installed it today. But still, same symptoms and the Jeep did not want to run and it stalled instantly. I don't know how my friend had the idea but he told me to crank it while he hold hand behind exhaust pipe. When I cranked it there was nothing coming from pipe. Not a single exhaustpressure. We instantly cut pipe before cat and crank it. Jeep started and ran perfectly (okay the noise was massive but anyways). So, all the time problem was clogged catalytic converter. Dang, never though of that.. But very many thanks for helping out and now I can start ordering new exhaust and many other parts to make this Jeep roadworthy
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Back in business! Last week repair kit arrived here in Finland. Long journey from States. I assembled all together and started the car. BUT, same symptoms. Nothing changed. Then I screwed fuel pressure regulator and now it gets 15 psi pressure at cranking engine. But still no start and when it tries to start it shuts down immediately and fuel pressure drops to zero. BUT now I think I might found the real reason for this problem. INJECTOR leaking badly. I don't know how I missed this with my friend. Injector totally floods the system and spraying isn't fine mist, instead it splashes gas everywhere. It is not the o-rings, they are new (there was new o-rings with repair kit) so it must be injector itself. Next thing was that I ordered new injector TJ39 from this link yesterday: https://www.ebay.com/itm/293891762548?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 (again from States) and it takes some time to arrive here in Finland (again). But hopefully this solves "mystery problem". It explains a lot of symptoms about stalling from driving the car and after starting it won't start because plugs are wet from overdose of gasoline. And I think somehow injector leaks pressure out of systems (is it possible if injector is stuck in open mode for some reason?). But anyway, after injector arrives and I get to install it, I will tell you how it went
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Today I was charged with motivation and took whole throttle body assembly out of the Jeep. I opened three torx holding the cup and that rubber "thingy" is the fuel pressure regulator. That seems to be okay but I dont know? I dont know what broken one looks like? Well anyways I'm going to buy new one. Seems that throttle body repair kits are available at ebay for reasonable price. Meanwhile I will clean whole assembly and split it twice and some more cleaning. What do you think Moses?
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Yes Moses, it is a good thing that is has now new pump. Also the fuel gauge shows now right amount gas in the tank (it was previously showing too much) and also it is good thing that tank is cleaned I need to buy that regulator and install it. Only downside is that taking off the whole throttlebody is a big job. But it needs to be done. I will inform how it goes and tell if it fixes the problem!
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Oh man.. today I installed new pump and test it. This Jeep must be cursed.. still not enough pressure. Nothing changed, same as my previous post. It must be the fuel pressure regulator? It has this kind of regulator: https://www.ebay.com/itm/Fuel-Injection-Pressure-Regulator-Standard-PR150-/274786462710?_trksid=p2349624.m46890.l49286 BUT. It is impossible to remove regulator without taking whole throttle body assemble out of the Jeep. There is three screws. Two is accessible but last one is not. Why it was engineered this way 😞 Oh man, what a job.. haven't start it yet and I need to dig up some motivation. If I understand correct there is spring inside regulator? If there is, I think it has broken and might explain this sudden dying of Jeep. Well, who knows..
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Wow, I was surprised, it was actually 20 gallon tank! And a plastic tank. I always tought it was metal. Well well. Pump looks original, there text stanced on it: 8933 002 251 5550 30389-3 PAT NO 4500270 I think it is original 1990 factory pump? Otherwise the whole assembly looks pretty good and there was only a little bit grud in a tank, nothing major. Good time to clean with soapy water and order new pump..
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That is true, I never touched or reset pressure regulator. Yeah, this 1990 wrangler is with a 15 gallon tank. In Europe (Finland) we talk about litres and 15 gallon is approximately 57 litres. I will order that pump with combination of fuel sender and assembly. It will take some time to arrive here in Finland from US. I will inform if this fixed the problem and I'm able to drive Jeep again!
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I think this is the right one for TBI?: https://www.ebay.com/itm/For-1987-1990-Jeep-Wrangler-Fuel-Level-Sending-Unit-Crown-51381HB-1989-1988-/392125484356?_trksid=p2349624.m46890.l49286
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Well well well. Time has passed since we have worked with Jeep, but I think we might have found the problem today. What we have done now: 1) Changed fuel filter. 2) Changed CPS (it was cheap, so why not?). 3) Changed O-rings to injector. Cleaned throttlebody. 4) Measured fuel pressure and here what we figured: Fuel pressure gets only to maximum 10psi when cranking, no more. And after not cranking pressure drops to zero after 10 seconds. Pump can't hold pressure so I think it leaks back to tank (no leaks under car or anywhere else)? It might be fuel pressure regulator also? But I don't think so.. But pump is original and driven 241tkm so.. I think now we order new pump, drop the tank and change it. Moses, what do you think? And yes, pressure was measured from TB-port as I mentioned in my last post. Now we need to buy right pump for TBI engine. Any good place to link?
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Quick update! I think my friend has found right fitment. Blue arrow is indicating the original port plug and others are different style fitments my friend found. Let see what fits best
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Thanks Moses, you are wonderful! Main issue finding correct fitment is that we have everything sized by centimeters. And that plug in test port is sized by inches. I have now unplugged it and my friend will ask around in stores if they have that kind of right size fitment for it. If we find right fitment size I have many different adapters to fit my fuel pressure gauge for it. I have now bought fuel filter and before trying to start engine, we will change it first. Yesterday when turning key in ignition we heard fuel pump every time buzzing, so I think it might be filter or pump sock. First filter and if it doesn't help, then the sock inside gas tank. We will continue investigating and I will inform how it progress!
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Thanks Moses. I perhaps explained it wrong. I had T-piece when I checked the fuel pressure. T-piece was under car (end of hard line and start from hose line) fuel flow trough throttle body normally to return line to gas tank. I know that optimal would be checking pressure from test port but I have hard time finding correct fitment (is there any link to ebay or some other place where I can find correct fitment?). But, yeah, you are correct; that way we measured was incoming line from fuel pump, not from test port. How much it should be? 30-40psi when cranking? If so, then we have clogged filter or pump itself is "kaput".
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Ok, just worked yesterday with Jeep. Checked these things: TPS. I took it out from throttle body and measured again. It shows 4,999V when throttle is wide open and I gradually moved that position and voltage changed from 0-5V very well without having problems. So, TPS is fine. I checked fuel pressure and when cranking it gave 12-14PSI. No start. Should cranking pressure be more than that? I measured pressure from fuel incoming line but not from the throttle body pressure port (I didn't have correct fitment for fuel pressure port) but under Jeep (where is the quicklocking system at hardline). Next time I will check CPS and fuel filter (actually I have ordered new CPS, it was only 10€ and easy to replace also fuel filter). I also wonder if ignition module is okay. There was a way to check that?
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Yeah. I think I will start checking fuel system after I got the fuel pressure gauge. Then I can check the pressure and also filter. I would like to drop the tank, but unfortunately before Jeep had this problem I filled the tank so I have to drain all fuel. Well, I'll be back soon and tell what I will discover..
