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Jun 22, 2017 11:37:54 GMT
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Thinking logically what does it need to accelerate the engine, it needs air, fuel and spark at the right time. Air is pretty easy check the intake an exhast from tip to tail for any obstructions or anything which is collapsing. For fuel (assuming it is open loop control) the injector pulse is primarily driven by throttle position and map then modified for temperature, if it idles we can probably ignore the temperatures, you have checked trottle, have you checked the map signal? If this fails next step would be the output, are the injector signals OK, fuel pressure ok etc. Finally there is the ignition which should be pretty easy to check with a timing light.
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Jun 22, 2017 13:25:31 GMT
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I've tested all sensors inc tps and reset it , map sensor I checked with vaccum and measured resistance against the specs All within tolerance and as should be too this is why am confused Even thought it may be ecu/chip issue although I know it was good as was from another car of mine Either way put it on other car started ran perfect revved ok
Tested injector outputs too with noid light I made up and all good
Infact I checked the whole engine loom for continuity back to ecu and all resistances within tolerance
Head scratcher fuel pressure up at rail is A1 Checked for leaky injector and spray which again look fine to me
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Jun 22, 2017 14:31:39 GMT
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ok youve done all the technical stuff ! and found nothing id be looking now at silly stuff ie take the petrol cap off to see if its nor vacuuming next id loosen the manifold bolts to see if the exhaust isnt blocked check for good earths evey were even put a jump lead from the neg to engine etc it cant be major as it starts n runs just wont pull under load ive had a few cars that drive me mad like this and its been staring me in the face or just simple and overlooked it hope you sort it andy
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Jun 22, 2017 14:44:54 GMT
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^^^ yeah I'm also assuming it's something really silly tbh or just something glaringly obvious I've overlooked too Exhaust is free (no cats either ? So it not that although good suggestion All earths were replaced and renewed as a precaution when I built the engine too Gonna swap the fuel pump relay today even though I checked it prior and see what happens
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froggy
Posted a lot
Posts: 1,099
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Jun 22, 2017 14:54:08 GMT
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I've got some known good o44 type from my car doing nothing if you want to try a different pump , you might have pressure at the rail but have you got the flow ? Can you get the rail off and hold the injector open with a 12v feed and measure flow to prove the pump is good , had an issue with my camper recently ,pump a bit noisy with a three year old 250lph 44 copy but ran pretty well , stuck s 300lph on and much better all round
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Jun 22, 2017 16:56:20 GMT
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I know there is a massive difference in a Cosworth lump to my humble 1.4 8 valve Astra, but the coolant temperature sensor went on that and provided the exact same symptoms? Don't even know if a Cossie has one, I changed everything before bridging it with a paperclip as a quick "I wonder" moment.
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Jun 22, 2017 17:27:02 GMT
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Have had the injectors off and done the bottle trick much like diesel bleed off test and measured against the cc rating All seemed ok and all pretty uniform in terms of spray pattern
Also changed fuel pump relay today no difference either Coolant temp sensor I've checked and all seems well although am waiting for both a new ecu temp sensor and air charge sensor to arrive hopefully tomorrow
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Jun 22, 2017 17:46:08 GMT
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Another thing , don't know if its been mentioned .... old immobiliser anywhere wired in ?
Just incase something obvious has been over looked .
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Jun 22, 2017 18:23:52 GMT
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Another thing , don't know if its been mentioned .... old immobiliser anywhere wired in ? Just incase something obvious has been over looked . Yeah that's a good shout mate but I removed all the old alarm whilst car was a shell Fitted a newer style alarm at same time as easier with engine out
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v8ian
Posted a lot
Posts: 3,748
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Jun 22, 2017 18:25:15 GMT
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Might be something, You say you have changed the injectors, if you still have the old ones check the resistance of them, from memory there are 2 different resistances for injectors,
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Atmo V8 Power . No slicks , No gas + No bits missing . Doing it in style. Austin A35van, very different------- but still doing it in style, going to be a funmoble
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Jun 22, 2017 19:05:28 GMT
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Yeah there's high impedance and low impedance I think you mean ?? Either way the injectors are matched and correct type for the chip 803,s
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Jun 22, 2017 21:23:57 GMT
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Is the map getting a proper signal, hose collapsing or something restricting the line?
turbo is spinning and not simply plugging the inlet/exhaust?
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Jun 22, 2017 21:30:12 GMT
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I've had the map sensor off placed a vac on it and checked resistance agin all good no issues Even swapped it out for a spare unknown map sensor with no change Pipes to it are the hard plastic type so no collapsing
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stealthstylz
Club Retro Rides Member
Posts: 14,812
Club RR Member Number: 174
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Jun 22, 2017 21:47:47 GMT
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Not sure how plausible this is as I've only ever seen it on a rally car after a big hit/dent, but could the fuel pickup be vacuuming itself to the bottom of the fuel tank?
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Jun 22, 2017 22:10:47 GMT
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Hi from memory the cossy had a crash/collision fuel pump cut out switch in the spare wheel well? not got a wet joint/corrosion making this half work if you know what i mean.
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Jun 22, 2017 23:20:23 GMT
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Not sure how plausible this is as I've only ever seen it on a rally car after a big hit/dent, but could the fuel pickup be vacuuming itself to the bottom of the fuel tank? Pump is externally mounted :/
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Jun 22, 2017 23:21:02 GMT
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Hi from memory the cossy had a crash/collision fuel pump cut out switch in the spare wheel well? not got a wet joint/corrosion making this half work if you know what i mean. I've already removed it and bypassed it in the boot
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I've just read through your thread, I'm certainly no expert and a lot of what's been said totally baffles me but years ago I had a customers car that did this. We tested pressures etc and all was fine but we found a damaged fuel pipe, all the pressures were fine but it wasn't allowing full flow due to being kinked by a jack or stand, it idled fine but starved when revved. Certainly wishing you all the best finding your problem though as we all know it bloody frustrating.
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Last Edit: Jun 23, 2017 8:33:53 GMT by zoompod
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Jun 23, 2017 10:53:51 GMT
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I've just read through your thread, I'm certainly no expert and a lot of what's been said totally baffles me but years ago I had a customers car that did this. We tested pressures etc and all was fine but we found a damaged fuel pipe, all the pressures were fine but it wasn't allowing full flow due to being kinked by a jack or stand, it idled fine but starved when revved. Certainly wishing you all the best finding your problem though as we all know it bloody frustrating. Cheers something I haven't checked either tbh hmmm Good shout mate
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Darkspeed
Club Retro Rides Member
Posts: 4,642
Club RR Member Number: 39
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Jun 23, 2017 12:49:29 GMT
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Had something similar in the past with the fuel pressure reg not being piped up correctly.
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