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  #1  
Old May 10th, 2018, 17:27
ljobbins ljobbins is offline
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Renix crank no start

88 stock engine ax15 trans

Was running rich but perfect then no start. Cranked for a while and started once more. Drove two blocks to my friends house and now no start. I had a pile of parts I wanted to swap to improve reliablilty and mpgs.

List of parts/things done:
New tps from napa one week before problem adjusted to 17%
IAC port cleaned one week before problem
Throttle body cleaned one week before problem
Grounds refreshed one week before problem(all grounds)
Now:
New CPS(thought was the problem since the old measured .35v) tests at .5/.51v
New ICU
New Distributor cap and rotor
New O2 sensor(was running very rich before
Verified spark to distributor cap and all cylinders
Verified fuel pressure with key on and cranking
Verified both temp sensors are good last week

So once again, it ran perfect and never died. It just stopped turning on. It cranks strong. With spark and fuel pressure what else? I can't imagine every fuel injector clogged at once. Help please
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  #2  
Old May 11th, 2018, 09:47
90XJ_Seth 90XJ_Seth is offline
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Re: Renix crank no start

Checked your fuel pump ballast connections or fuel pump relay?
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  #3  
Old May 11th, 2018, 10:05
ljobbins ljobbins is offline
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Re: Renix crank no start

Eliminated ballast resistor and I have full fuel pressure with key on and while cranking. It has to be a spark issue or lack thereof.
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  #4  
Old May 11th, 2018, 10:06
ljobbins ljobbins is offline
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Re: Renix crank no start

Im going to try to push my cps down further in an hour or so to see if a tiny bit more power helps.
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  #5  
Old May 11th, 2018, 10:26
90XJ_Seth 90XJ_Seth is offline
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Re: Renix crank no start

Is your map line connected to the throttle body correctly? An engine won't start and if running will shut down immediately if the electrical connector is out or if the tube going from the map to the TB is cracked or disconnected.
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  #6  
Old May 11th, 2018, 10:39
90XJ_Seth 90XJ_Seth is offline
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Re: Renix crank no start

One other consideration, do you have a Power Latch Relay in your rig? if you do, you should be able to get power to the fuel lines but no spark when you try to start it if the relay goes bad. You could snag the AC relay or O2 sensor relay and swap quickly to check without any issue as they are identical.
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  #7  
Old May 11th, 2018, 11:45
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Re: Renix crank no start

so you've verified fuel pressure at the rail and spark at the plug. You should also verify the injectors are firing (use noid light).

also suspect it may be flooded. Try cranking with accelerator to the floor (not pumping, held at WOT). This will turn off the injectors and allow the motor to clear a flooded condition.
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  #8  
Old May 12th, 2018, 12:11
ljobbins ljobbins is offline
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Re: Renix crank no start

So I didn’t have time to work on it yesterday and my next chance is Tuesday. I want to see if I can move the cps closer. I will check the injectors. I will check to see if it’s flooded. A guy told me that it could be a bad pick up sensor in the distributor. Is there a way to test that? And if so, is that a stand alone replacement or part of the distributor assembly? Thanks
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  #9  
Old May 12th, 2018, 13:31
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Ecomike Ecomike is offline
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Re: Renix crank no start

A bad Cam sensor in the dizzy will not keep it from starting. CPS at .50 volts (if the meter is accurate) is more than enough.

You do or do not have spark???? Renix is easy to flood with a no spark!!!

No spark, no fuel injection, flooded, or timing on the dizzy/timing chain....
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  #10  
Old May 15th, 2018, 09:39
ljobbins ljobbins is offline
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Re: Renix crank no start

Update.

I verified .5v at the new cps. Verified everything and still no start. A friend knows a mechanic that knows jeeps and he came over and found the smallest piece of melted plastic on the middle contact of the distributor cap(between the cap and the rotor). Said that’s most likely the problem. Still no start. So just to see what happens we swap the original cps back in and it starts instantly but dies with gas. Verified fuel pressure to be correct and all other sensors perfect.

So could my old cps be bad and cause the erratic idle and die with gas applied? And could the new one be bad but still register .5v on the multimeter?

So just to recap. It ran perfect then just didn’t start.
New o2 from horrible mpgs
New cap and rotor now
Verified spark on all cylinders
Verified fuel pressure is good and all injectors firing
TPS new from Napa from delayed and erratic acceleration (prior to problems)
Grounds refreshed
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  #11  
Old May 15th, 2018, 09:44
ljobbins ljobbins is offline
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Re: Renix crank no start

The only sensor I have never replaced is the map because I believe in trying to keep original parts on if I can since they don’t exist anymore. I have tested it a few times and I verified the vacuum line is clear and has a good connection on both sides. However I want to tap the throttle body to get a better connection or at least in my mind it will be better.
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  #12  
Old May 15th, 2018, 10:01
Royal Nonesuch Royal Nonesuch is offline
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Re: Renix crank no start

It's kind of a pain to get at, but you should check to see if your ignition switch is burnt out. When I had a crank/no start with fuel and spark condition, that's what it ended up being.

It's midway down the steering column, up underneath the dash.
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  #13  
Old May 15th, 2018, 13:56
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Re: Renix crank no start

Maybe two problems. If the IAC is not set right it will not start, as it is starved for air, or gets too much. Thus a sticking IAC or B+ relay problem.

Dying when you give it gas sounds like a different issue, problem #2. Try flooring it to WOT when cranking, that will dry it out of it flooded. Make that a routine!!

I'd check the fuel pressure running and as you give it gas!!!! The FPR is vacuum operated and changes the fuel pressure when you give it gas, if the FPR leaks fuel into that vacuum line it is bad!!!!

You may have fuel pressure when cranking but how about when pressing the gas )got to get it running first).

You could have a weak spark!!!! Low voltage to the ICM/HV coil!!!! Or a bad ICM?
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34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
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  #14  
Old May 15th, 2018, 14:33
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Re: Renix crank no start

First off, since you have been trying a while, you may have wet fouled the plugs. Renix is really finicky about that. I would get the cheapest set of Champions you can get and swap the plugs. Make sure you are getting a nice fat spark at the plugs. If you are getting a good fat spark, then the CPS is good and very likely the coil as well.

It is a long shot, but the Cam Position Sensor in the distributor could have it firing on the wrong cycle, but you should still at least hear some popping.

Borrow a NOID light at Autozone and check for electrical pulses at the injectors. Do you smell gas in the tailpipe? With all that cranking, you should. A cheap test is to spray some ether starting fluid or carb cleaner down the intake when cranking. If it fires, you have a fuel problem.
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  #15  
Old May 15th, 2018, 14:34
ljobbins ljobbins is offline
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Re: Renix crank no start

It’s starting now and running for 10-20 seconds at a time. Idles fine for a few seconds then starts a slow surge to drop until it dies. I have had a bad iac once and it doesn’t do the normal fast surge. Fuel pressure is 35 at idle and jumps to 40ish with a fast opening of the throttle. Fuel pressure never drops.
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