RRC EFI 3,9 (1991) smoke and water exhaust

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roule

Active Member
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107
Location
france
Hi there,

I have been finishing the restoration of my old range (RRC from 1991- 3.9 liter petrol) for 3 years, I start it from time to time but without driving it. On the other hand, I have a question about my cylinder head gasket: at start-up (quarter turn each time) and for a few seconds I have no visible smoke from the exhaust, then then moderately heavy white/gray smoke and lots of condensation. I collected today the equivalent of 15 cl in about 10 minutes at the exit of the pot. Its color is orange (my LDR is green) with a strong almond smell. I was thinking hydrocyanic acid due to poor combustion? I would like to point out that my fuel tank has been practically empty for a while, I must have had a lot of condensation inside too... maybe the explanation for this smoke, and the orange color could be oxidation? My LDR level is stable. Do you have any idea about this problem?

Thank you for your contribution.
 
If its only been started every now and again and left to idle there will be a lot of condensation in the exhaust which would normally dry out as it get run but if not dried will rust it inside.
 
roule said:
Hi there,

I have been finishing the restoration of my old range (RRC from 1991- 3.9 liter petrol) for 3 years, I start it from time to time but without driving it. On the other hand, I have a question about my cylinder head gasket: at start-up (quarter turn each time) and for a few seconds I have no visible smoke from the exhaust, then then moderately heavy white/gray smoke and lots of condensation. I collected today the equivalent of 15 cl in about 10 minutes at the exit of the pot. Its color is orange (my LDR is green) with a strong almond smell. I was thinking hydrocyanic acid due to poor combustion? I would like to point out that my fuel tank has been practically empty for a while, I must have had a lot of condensation inside too... maybe the explanation for this smoke, and the orange color could be oxidation? My LDR level is stable. Do you have any idea about this problem?

Thank you for your contribution.
Click to expand...
Pull the spark plugs and check if any are steam cleaned, will give an indication of head gasket failure.
 
Are you losing any coolant?

Burning a gallon of petrol or diesel produces amongst other things a very large quantity of water.
This condenses inside a cold engine & exhaust system.
Manifests as steam out of the exhaust - esp visible in cold weather - and is what drips out of the tailpipe.
Also as mayo in the engine - oil filler cap - as it doesn't boil off until the engine is hot.
Main reason for cars that only do short trips rotting out exhausts quicker than those that do long journeys. They rot from the inside out.
I sometimes wonder how many have been ripped off by unscrupulous garages telling them that mayo is a surefire indicator of hg problems.
If you aren't losing any coolant then you don't have a coolant related hg issue.
 
Bonjour,
Toujours autant de fumée blanche...moteur chaud , température extérieure 20 degrés, et pas de perte de liquide refroidissement. Le range est dans le garage depuis 3 ans, mais je le démarre toutes les semaines...
 

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roule said:
Bonjour,
Toujours autant de fumée blanche...moteur chaud , température extérieure 20 degrés, et pas de perte de liquide refroidissement. Le range est dans le garage depuis 3 ans, mais je le démarre toutes les semaines...
Click to expand...
Fair une essai de route avec et voir comment ça se passe 😉
 
Le pot a dégueulé pas mal de flotte (petite flaque sous le pot que j'ai volontairement percé...je fais un essai route demain...
 
roule said:
Le pot a dégueulé pas mal de flotte (petite flaque sous le pot que j'ai volontairement percé...je fais un essai route demain...
Click to expand...
De nombreux démarrages sans faire de course auront produit beaucoup de condensat. Je suis sûr que quand il fera assez chaud pour sécher l'échappement, tout ira bien
 
Bien vu pour le conseil, je me suis décidé à rouler un peu avec le range (pas trop loin il n'est assuré que pour le garage encore), plus de fumée blanche visible, ou à peine...c'était donc bien la condensation consommée depuis si longtemps.
Par contre après avoir fait une 2ème vidange il y a 15 jours, j'ai toujours cette odeur d'essence sur la jauge d'huile.
Suspectant un injecteur fuyard, j'ai contrôlé la résistance sur le circuit d'injection et pour le circuit de la rampe d'injection pair (pin 2 et 11 de la broche ECU) je trouve 5,5 ohms au lieu de 4,5 , ce qui pourrait laisser supposer qu'un de ces injecteurs est fuyard ...prochaine étape de vérification de l'état des bougies et peut être démontage de la rampe...
 
J'ai fait les 4 bougies de la rampe de gauche, elles sont toutes identiques...un peu de suie sur l'électrode centrale, et couleur brun chocolat sur l'électrode de masse. Si j'avais un injecteur fuyard, il me semble qu'une des électrodes devrait être différente ?
 

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